"I Gotta Feeling" is the second single from The Black Eyed Peas' fifth album The E.N.D, produced by French DJ David Guetta. The song was released on June 23, 2009 and debuted at number two on the Canadian and Billboard Hot 100 on the week of June 27, 2009, behind the group's "Boom Boom Pow", making the group one of 11 artists who have occupied the top two positions of the Billboard Hot 100 at the same time. The song later reached number one on the US charts and 20 charts worldwide.

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. "I Gotta Feeling" was 5th on the Billboard Hot 100 Songs of the Decade. The song was also nominated as Song of the Year at the 2009 World Music Awards. In March 2011, it became the first song in digital history to sell over 7 million digital copies in the United States. As of April 2015, it has sold over 8.6 million downloads in this country. This also makes it the highest selling digital as well as non-charity single in the US ever.

"I Gotta Feeling" spent 14 consecutive weeks atop the Billboard Hot 100, the longest-running number-one single of 2009. The song was the third most successful song of the decade in Australia, as announced on January 7, 2010. As of February 2010^[update], "I Gotta Feeling" holds the record as the most downloaded song on iTunes of all time. Worldwide, it was the most successful song of the 21st century (with estimates putting combined sales and streams between 13 and 15 million units) until passed by "Happy" by Pharrell Williams in 2014.

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