"Last Friday Night (T.G.I.F.)" is a song by American recording artist Katy Perry. The song was written by Perry, Dr. Luke, Max Martin and Bonnie McKee, and was produced by Dr. Luke and Max Martin. It is the 5th single from Perry's 3rd studio album, Teenage Dream by Capitol. Prior to its single release, "Last Friday Night (T.G.I.F.)" peaked at number 67 on the Billboard Hot 100 and number 49 on the Canadian Hot 100 because of digital sales.
