album cover for Smile by Katy PerryWith her sixth studio album Smile dropping today (read our review here!), we’re looking back at the many sides of Katy Perry. Today we’re highlighting Perry’s stellar songwriting skills; having written or co-written almost all of her songs, there’s also been a few occasions when other artists have been blessed to end up with a Perry-penned track on their hands. Here are some of the best.

Kelly Clarkson, I Do Not Hook Up (2009)

I Do Not Hook Up was co-composed by Perry along with Grammy-winning musician and producer Greg Wells, and singer-songwriter-producer Kara DioGuardi. Perry originally intended to use the song for herself, but following her departure from the Def Jam label, she gave this track, and a second one she’d written – Long Shot – to Clarkson. What a darling! Both songs appeared on Clarkson’s fourth album All I Ever Wanted.

Selena Gomez, Rock God (2010)

This synth-pounding cut turned up on Selena’s 2010 album A Year Without Rain. Upon its release, the singer told MTV News: “I had to fight for that song, I wanted it so bad – it’s kind of funky… I used [Katy’s] style and we mixed it up with my style, so we made it a bit more techno.” Katy also provided some background vocals for the track.

Britney Spears, Passenger (2013)

Passenger glimmers with a frenetic, bleeping synth, then falls into heavy half-time as Britney sings about the joys of taking a new relationship to the world “without a map.” It’s from her album Britney Jean, and the artist said of Perry and her songwriting talents: “I’m a huge fan of hers; I think she’s an amazing vocalist, she has a beautiful voice. And I love the song – the moment I heard the song, I was like ‘This is really beautiful.’ I’m really proud that I was able to do it.”

Iggy Azalea Feat. Rita Ora, Black Widow (2014)

Black Widow is another cut which Katy initially intended to keep in her own pocket, but she decided to hand-ball the demo she’d recorded over to Oz artist Iggy Azalea for completion. Iggy spun a rap, grabbed Rita Ora to sing the hook, and the whole she-bang ended up on Iggy’s debut album The New Classic.