"Last Friday Night (T.G.I.F.)" is a popular song by American singer Katy Perry. It was released as the fifth single from her third studio album, "Teenage Dream," in 2010.

"Last Friday Night" is an upbeat and catchy pop song with a party anthem vibe. The song's lyrics narrate the story of a wild and unforgettable night of partying and misadventures that the narrator experienced on the previous Friday night.

The song was written by Katy Perry, Dr. Luke, Max Martin, and Bonnie McKee. It features Katy Perry's signature vibrant vocals, capturing the carefree and fun spirit of the lyrics.

Upon its release, "Last Friday Night" achieved commercial success and critical acclaim. It topped the charts in several countries and became one of Katy Perry's most successful songs. The song's infectious chorus, Katy Perry's energetic performance, and its relatable themes of partying and enjoying life resonated with audiences, making it a favorite among fans of pop music.

The music video for "Last Friday Night" features a humorous and nostalgic storyline about a young woman named Kathy Beth Terry (played by Katy Perry) who wakes up after a crazy party with no memory of what happened the previous night. The video includes various cameos from celebrities, adding to the comedic nature of the visuals.

"Last Friday Night" received positive reviews from music critics, who praised its fun and upbeat sound, as well as Katy Perry's performance.

Over time, "Last Friday Night" has remained a beloved and iconic song in Katy Perry's discography. Its catchy and party-ready nature, Katy Perry's energetic vocals, and its celebration of memorable nights out with friends have made it a timeless pop anthem, capturing the essence of carefree and enjoyable moments in life.