"Starstrukk" is a song recorded by American electronic rock group 3OH!3. It is their third single and their second single to be released from their second studio album, Want. A radio-only and the deluxe album version has been released featuring pop star Katy Perry. The version featuring Katy Perry has had considerable success in Australia, Belgium, Finland, Ireland, Poland and the United Kingdom, reaching the top 5 in all of these countries. It is the follow-up to their debut single "Don't Trust Me".

Advertisements for Candy Girls use the song "Starstrukk". The song also featured on the third episode of the first season of The Vampire Diaries. It was also used during a preview of the movie "Couples Retreat", while the Katy Perry remix is in both the trailer and film, When in Rome as well as in the video game, FIFA 11 (European version only).

This song was covered by Marina and the Diamonds on Britain's BBC Radio 1 and at a few of her live performances, most notably, the Glastonbury Festival. A studio recording of her cover was included as the B-side to her 2010 single "Oh No!".

Katheryn Elizabeth Hudson (born October 25, 1984), known by her stage name Katy Perry, is an American singer, songwriter and actress. Perry grew up with gospel music, and during her first year of high school she pursued a music career as Katy Hudson, releasing her first studio album called Katy Hudson which failed to chart. She recorded a solo album later, which was never released. After signing with Capitol Music Group in 2007, her fourth record label in seven years, she adopted the stage name Katy Perry.

She first gained recognition with the release of her first mainstream album, One of the Boys in 2008, which spawned three Billboard Hot 100 top-ten songs—"I Kissed A Girl", "Hot n Cold" and "Waking Up In Vegas". Perry supported the album with her Hello Katy Tour. In 2010, her third studio album, Teenage Dream (2010), which topped the Billboard 200 chart, and spawned five number one singles—"California Gurls", "Teenage Dream", "Firework", "E.T." and "Last Friday Night (T.G.I.F.)"—Teenage Dream was the only album (after Michael Jackson's Bad)—to do so, and the first female in history to achieve this milestone. She embarked on the California Dreams Tour, which grossed nearly $60 million worldwide. Perry re-released the album under the name of Teenage Dream: The Complete Confection on March 26, 2012, and the re-release has already spawned the number-one single "Part of Me".