Allow me to blow your mind with this fact: pop stars don't always write their own music. I mean, not everyone can be Taylor Swift, okay? Okay, obviously not very shocking. What might surprise you? That some celebrities are actually the scribes behind some of the biggest hits on the radio — they're just not the recording artist on the track. So which stars famous for their own tunes have penned hits recorded by other artists? Click through to find out.
The “Die Young” singer writes most of her own music, and she’s penned plenty of party tunes for other pop stars as well.
"Till The World Ends," Britney Spears
Kesha told Digital Spy that she wrote the single off Spears’ 2011 Femme Fatale album specifically for the star.
"Disgusting," Miranda Cosgrove
Kesha actually penned this track for her own album, but it didn’t make it onto the final cut. Though Kesha had reservations about giving the song to another artist, she eventually let former iCarly star Cosgrove record it for her album Sparks Fly.
"The Time of Our Lives," Miley Cyrus
Before Cyrus edged up her image, Kesha wrote this “party song for a younger crowd” for the artist, telling MTV News that she thought the “We Can’t Stop” singer had a “cool, fun vibe.”
Jessie J Wrote...
The “Bang, Bang” singer has penned several radio hits, one of which she said paid her rent for three years.
"Party in the USA," Miley Cyrus
The tune spent 28 weeks on the Billboard Hot 100 list, and Jessie J made serious bank off the hit before she became famous for recording her own music.
Katy Perry Wrote...
The “I Kissed A Girl” singer has co-wrote several songs for other pop stars.
"Passenger," Britney Spears
Perry and singer-songwriter Sia co-wrote the track alongside Spears, who is listed as the primary writer.
"I Do Not Hook Up," Kelly Clarkson
Perry recorded her own version of the track, which is a little edgier than the one the American Idol winner turned into a hit. Perry’s original line was “keep your thing in your pants and your heart on your sleeve,” which Clarkson’s team cleaned up to “keep your hand in my hand.” Perry also penned Clarkson’s “Long Shot.”
"Bullet," Jessie James
Perry is credited as co-writer on the twangy tough girl tune.
"That's More Like It," Selena Gomez & The Scene
Before Gomez struck it out on her own, her former group recorded this Perry-penned pop tune.
Harry Styles Wrote...
The One Direction star is more than just a pretty face — he’s also a songwriter.
"Just A Little Bit of Your Heart," Ariana Grande
How many girls can say that Harry Styles wrote a love song for them? Grande now can — he penned this track for her album My Everything.
The Dream & Christina Milian Wrote...
Back when they were a couple, this pair also made sweet music together — except, you know, for other people.
"Baby," Justin Bieber
Yep, one of the biggest hits the Biebs has ever had was penned by these celebs. The singer is also credited as a songwriter on the track.
Pink is more than just a powerhouse voice — she’s also an excellent songwriter.
"Whataya Want From Me," Adam Lambert
The former American Idol star made the Pink-penned track — which was originally going to appear on her own album Funhouse — his second single from his album For Your Entertainment.
Bruno Mars Wrote...
He may be known for his own hits like “Treasure” and “Locked Out of Heaven,” but he has quite a few songs that he wrote that ended up in the hands of other artists.
"Forget You," Cee Lo Green
It’s hard to imagine anyone other than the big-voiced Green singing this 2010 hit, but it was originally written by Mars.
"Right Round," Flo Rida
Mars is the man behind this party tune, which was also featured in the end credits of The Hangover. Also involved in the track was a then-unknown Kesha, who sang the backup vocals.
Taylor Swift Wrote...
The “Blank Space” singer lent her tunes to this country star.
"Best Days of Your Life," Kellie Pickler
Pickler and Swift co-wrote this track about a cheating boyfriend shortly before going on tour together.
Chris Brown Wrote...
The “Forever” singer gave this track to his then-girlfriend.
Though he originally planned to record the song himself, he opted out, leaving it open for his then-girlfriend to turn into a hit.
Taylor Momsen Wrote...
The former Gossip Girl star and lead singer of the Pretty Reckless inadvertently wrote a track for this “singer.”
"Blackout," Heidi Montag
Momsen allegedly wrote and recorded the track “Blackout” at just eight years old. Years later, the former Hills star put it out as her own single. Sure, “Blackout” may not exactly be a hit (I mean, have you ever even heard of it?), but it is a pretty bizarre story.
The “Chandelier” singer has a killer voice, but you may be surprised to learn that she’s also the writer behind some major hits.
"Pretty Hurts," Beyoncé
Sia originally sent the song to Katy Perry, who apparently didn’t see the e-mail from her pal. Beyoncé picked it up instead and released it in 2013.
The version that Rihanna recorded is almost identical to the one that the writer demoed.
"You Lost Me," Christina Aguilera
Aguilera recorded this Sia-written tune for her 2010 album Bionic.
"Perfume," Britney Spears
Sia marked her territory on Spears’ 2013 album Britney Jean with this track.
The “Let Me Love You” singer is behind this girl power single.
Ne-Yo apparently has serious regrets about giving up the ex-bashing track — which was originally written from a male perspective — and stated that he really wrote it “for himself.” Guess Ne-Yo really was replaceable.
Avril Lavigne Wrote...
The “Girlfriend” singer penned this famous empowerment track.
"Breakaway," Kelly Clarkson
Though Lavigne intended to use it for her first album, she chucked it when she decided it didn’t fit the record. Clarkson snatched it up and recorded it for the soundtrack of the Princesses Diaries 2.
Christina Aguilera Wrote...
The “Candyman” singer co-wrote this pop hit.
"Miss Independent," Kelly Clarkson
Clarkson’s a lucky girl — the American Idol winner has recorded songs by several lady hitmakers, including her very first single outside of the reality competition.