"I Gotta Feeling" is a song by the group Black Eyed Peas and their second official single from their fifth studio album The E.N.D.. The song debuted on May 21, 2009. The song was produced by acclaimed French house DJ David Guetta. "I Gotta Feeling" debuted at number two behind the group's own "Boom Boom Pow" on the week of June 27, 2009, on both the Canadian and BillboardHot 100 charts, making the group one of only eleven artists who have occupied the top two positions at the same time on the BillboardHot 100. The song went on to replace "Boom Boom Pow" at Number 1 on the US charts and eventually reach Number 1 on 20 charts worldwide. It tied with "We Belong Together" by Mariah Carey for longest weeks at number one for the 2000's decade and also tied with Whitney Houston's I Will Always Love Youfor the second-longest running number one of all time, only behind "One Sweet Day" by Mariah Carey feat. Boyz II Men. It was named 5th on the BillboardHot 100 Songs of the Decade. The song was nominated for Record of the Year at the 52nd Grammy Awards and won the Grammy for Best Pop Performance by a Duo or Group with Vocals. The song is also nominated as Song of the Year at the 2009 World Music Awards. The song is the most downloaded song ever on iTunes. To date the song has sold over 5 million copies in the United States according to Nielson SoundScan.

On Dipdive, while premiering "I Gotta Feeling" and cover artwork, underneath both, will.i.am posted of the topics related in the song:

"this song is dedicated to everyone who is getting ready to go out...

it's the song to listen to when you drive to the club or party...

it's the song to listen to after a long day or week at work...

it's the song to that makes me wanna throw my stress away..."

It is set in common time and is composed in the key of G major with a moderate tempo of 128 beats per minute. The group's vocal range spans from G ₃to A ₅.

Billboardgave the song a positive review: "The Black Eyed Peas proved with their massive international chart-topper "Boom Boom Pow" that they're a group still to be reckoned with. The official follow-up single "I Gotta Feeling" may be their most mainstream release yet. Over a pop-throbbing beat, courtesy of the famed club hitmaker David Guetta, the Peas trade off on a simple, yet effective melody and message: "Tonight's gonna be a good night." Having already shown what they can do at the peak of a party, now they're out to prove they can get it started even earlier". Bill Lamb of About.comgave the song 4 out of 5 stars commenting on the feel-good mood, distinct change of pace for them, and that it is a great choice for summer. Overall, he thinks that "Boom Boom Pow" and "I Gotta Feeling" deliver contributions that make it obvious Black Eyed Peas are still a four-person group and that this is a hit.

David Balls of Digital Spy gave the song 4 out of 5 stars:

Now, hot on the heels of the heavy Auto-Tune and futuristic synths of 'Boom Boom Pow', they're back with a single that's already made number one in Oz and the US. What's more, 'I Gotta Feeling' is every bit as quirky as its predecessor. Built around a sample from David Guetta's 'Love Is Gone', it begins in relatively restrained fashion before suddenly morphing into a throbbing rave-up... and proceeds to flit between tempos for the rest of its five-minute duration. A bit like Girls Aloud's 'Biology', it's a random, rather barmy mish-mash of musical ideas that only really makes sense after a few listens, but there's no doubt the Peas still know how to get us dancing.

Comedy website Cracked.com however, gave the song a rather scathing review, with host Wayne Gladstone stating, "I don't care how many gangly superfluous band members you float in the air, at this point you need to start the song." This was in reference to the repetition of the chorus of 'tonight's gonna be a good night' for roughly a minute and a half. The review was scathing in its critique of auto-tune, lyrics, rhyming the same word with itself ("Up and "Up"), naming days of the week (which was seen as comparable to "Naming the Alphabet") and Jewish religious phrases being used out of context.

A remix edit by David Guetta appears on his latest album, .

In her 2009 comedy special Ellen's Bigger, Longer & Wider Show, comedian Ellen DeGeneres performed a dance to the song during the opening segment of the show.

The song was performed on the first results show of The X FactorUK Series Six, by all the 12 Finalists, before the first act was eliminated. It is also performed by the finalists on the opening of the current X Factor Tour.

On September 8, 2009, the song was performed by the Black Eyed Peas for the taping of the Kickoff Party for the 24th season of The Oprah Winfrey Show, with 21,000 fans performing a flash mob dance on the "Magnificent Mile" portion of Michigan Avenue in Chicago, Illinois.

A version celebrating the Philadelphia Phillies National League victory is titled "Phillies Gotta Feeling."

Alvin and the Chipmunks & The Chipettes covered the song for the movie, Alvin and the Chipmunks: The Squeakqueland the movie's soundtrack.

A remix performed by reggaeton artist MJ was released on the Internet. Black Eyed Peas performed this song at the 52nd Grammy Awards nomination announcement ceremony known as The GRAMMY Nominations Concert Live!! — Countdown To Music's Biggest Nightalong with David Guetta.

This song is now the official support song for the Portuguese National Team towards the 2010 Football World Cup. In a video spread in the Internet, the band members show their support to Portugal and its players. ' The song is featured in commercials for the 2010 movie Valentine's Day.

The group performed the song in a commercial for Target stores.

The song was featured during the 2010 Winter Olympics for a member of the women's snowboarding team.

The song was covered by the Top 20 in American Idol as a group song.

An unfinalized version of the music video was leaked on May 29, 2009. The official final version was released on June 2 on Dipdive and on June 16 on iTunes.

There is both a censored version and an explicit version of the music video. The video first starts out with some scenes in Hollywood Blvd. Then it shows will.i.am combing his hair and Fergie putting on makeup wearing lingerie. It also shows Taboo checking his messages on Dipdive and apl.de.ap checking his text messages. Then it cuts to the party as the first verse starts. In the uncensored version, two women are kissing at the two minute mark, at which point the lyrics "Let's take it...off!" are heard, and a hand grabs the top of the dress of one of the women, and pulls it down, exposing her left breast. All members of the Black Eyed Peas are shown dancing. Later, they are dancing with their faces and hands painted with phosphorescent paint. The video ends with a large sign with human-sized letters that reads "The E.N.D."

The video is directed by Ben Mor of Little Minxand features guest appearances by David Guetta, Kid Cudi, Katy Perry, Chantal Jones, members of the indie rock band Gossip, the designer duo Dean and Dan Caten of Dsquared and a few well-known personalities of the LGBT community, including Ongina of RuPaul's Drag Racefame.

"I Gotta Feeling" was the group's highest debut on the Hot 100, debuting at number two. As of the end of 2009 the song has sold 4,500,000+ copies. "I Gotta Feeling" ended the 12 week number-one run of the band's previous single "Boom Boom Pow", when it reached number one on the Hot 100 the chart week of July 11, 2009, their second single to do so. It makes the band only the fourth group to replace themselves at number one in the chart's history, following The Beatles, Boyz II Men, and OutKast, and the first to do it in the digital download era. "I Gotta Feeling" had remained Number 1 on the Hot 100 for fourteen weeks, extending the band's run at number one on the Hot 100 to 26 consecutive weeks, or half a year straight. The song was knocked off the top of the chart to Number 5 on October 17 by "Down" by Jay Sean featuring Lil Wayne. The longest running #1 hit of 2009, the tune is tied with five other songs as the second longest running Hot 100 Number 1. It is also tied with Mariah Carey's "We Belong Together" as the longest running Hot 100 Number 1 of the 2000s. Apart from that, the group holds the record for longest consecutive run at Billboard's Hot 100 number one. The Black Eyed Peas are also just the third artist to have multiple songs spend 12 weeks at Number 1 on the Hot 100. Boyz II Men and Mariah Carey are the only other artists to do this. In fact, I Gotta Feelingis the highest-charting hip-hop song on the adult contemporary chart. The song has become the group's most successful digital single selling 5,179,513 copies by the end of February.

On the American Top 40, the song made a long-week run on the top. It topped the AT40 chart for seven weeks, tied with Lady Gaga's "Poker Face". The song peaked at #1 on the said countdown on August 22, 2009, and ended its long-week run at the top on October 3. On the next week, October 10, "I Gotta Feeling" fell to #4, and Taylor Swift held the top spot with "You Belong With Me".

"I Gotta Feeling" has become the Black Eyed Peas' most successful single of their career, topping over 25 charts internationally. It replaced "Boom Boom Pow" at number one on the Canadian Hot 100 and Australian ARIA Chart. In New Zealand the song debuted at number seven on June 15, 2009, reaching number one two weeks later, making the song their fifth number-one single in New Zealand. The song has spent nine consecutive weeks at number one, becoming their longest-running number one single there. It was certified 2x Platinum after twenty-two weeks on the chart, selling over 30,000 copies.

In Ireland, on its third week on the chart "I Gotta Feeling" jumped from Number 18 to 2 with strong download sales, outpeaking their last single "Boom Boom Pow", which reached Number 3. The next week, it climbed to Number 1 giving them their fourth number-one single there. The song spent 12 non-consecutive weeks at Number 1 in Ireland.

In the United Kingdom the song debuted at number 70 in June 2009 and entered the top 40 of the UK Singles Chart on the week ending July 11, 2009. It slowly worked its way up the chart and in its eighth week (August 2, 2009) it peaked at number one on downloads alone (with its physical release being August 10). Therefore giving the group their second consecutive number one hit from The E.N.D., their third number one overall and their ninth top ten hit in the country. On the same week it reached the summit of the UK singles chart, "I Gotta Feeling" became the new number one on the UK R&B Chart. Although it was knocked off the number one spot of the UK Singles Chart by Tinchy Stryder the following week, it regained its position at Number 1 on August 16 marking the Black Eyed Peas second (and consecutive) song to have had two separate runs at number one, and one of only six songs to have managed the feat in the 21st century (including "I Gotta Feeling" and "Boom Boom Pow"). The song appeared in the top 10 of the UK Singles Chart for 17 weeks, which is longer than the time spent in the top 100 as a whole for several other Black Eyed Peas songs, and stayed in the top 40 for over half a year, finally dropping to #41 on the first chart of March 2010. I Gotta Feeling has sold 950,000 copies in the United Kingdom, outselling the biggest selling single of 2009, Lady Gaga's "Poker Face". It was also announced as the 18th biggest selling single of the decade. "Boom Boom Pow" was the 7th best selling single of the year with around 600,000 copies sold, and "Meet Me Halfway" was the tenth biggest selling, with over 500,000 copies.

The song was the third most successful song of the decade in Australia, as announced on January 7, 2010. The decade-end chart also revealed the song to be the most successful song of 2009. As of February 2010, "I Gotta Feeling" holds the record as the most downloaded song on iTunes of all time.