Have you been bobbing your head to "Babe" by Sugarland? Turns out, you have Taylor Swift to thank. And she's not the only one moonlighting as a secret songwriter. Music fans,

prepare to be surprised: The following tunes were written by an artist who _wasn't _the one who performed them. "BETTER MAN" BY LITTLE BIG TOWN Swift also penned "Best

Days of Your Life" by Kellie Pickler, "You'll Always Find Your Way Back Home" by Miley Cyrus, and infamously, "This Is What You Came For" by Calvin Harris and

Rihanna. "WE FOUND LOVE" BY RIHANNA Swift may have helped write a song for Harris, but he's got plenty of songwriting talent of his own. He wrote Rihanna's smash hit

"Let Me Love You (Until You Learn To Love Yourself)," is this Beyoncé track, which pretty much means we're forever in Sia's debt. "TILL THE WORLD ENDS" BY

BRITNEY SPEARS Like Sia, Kesha's written songs for a number of other artists (or they've gotten the ones that didn't make it onto her own albums.) Not the case with "Till

the World Ends," however, which Kesha wrote with Spears in mind. "That song was written specifically for Britney," she told _Digital Spy_. "I put my brain in Britney

Spears land and wrote that whole song for her." "IRREPLACEABLE" BY BEYONCÉ It's the ultimate post-breakup girl power track, but Beyoncé's hit was originally intended

to be sung from the _male _perspective. Ne-Yo was the one who wrote the song, and he reportedly regretted giving it up afterward. "THAT'S MORE LIKE IT" BY SELENA GOMEZ &

THE SCENE Remember when Gomez had a band? Back then, she had an unexpected songwriter, too: Fellow pop goddess Katy Perry, who wrote this tune for Gomez and her group. "WHATAYA WANT

FROM ME" BY ADAM LAMBERT One of Lambert's biggest hits _wasn't _written by the _American Idol_ alum. Instead, it's the work of Pink, who has quite the songwriting chops

in addition to a killer voice. "PARTY IN THE USA" BY MILEY CYRUS You may think of this song as a big hit for Cyrus, but it did plenty for its writer, Jessie J, too—she has said the

royalties paid her rent for three years! "LITTLE THINGS" BY ONE DIRECTION If you hear 1D's acoustic melody and think, hey, that sounds like something Ed Sheeran would sing,

there's a reason why: He wrote it! "BREAKAWAY" BY KELLY CLARKSON From one aughts pop icon to another. Avril Lavigne wrote this heart-wrenching record for her debut album in

2002, but it didn't make the cut. Clarkson definitely did it justice, though! "FORGET YOU" BY CEE LO GREEN With those distinct vocals, it's hard to imagine any big name

connected to "Forget You" _besides _Green's. But there is one: Bruno Mars wrote the song for the former _Voice _judge. "ELEVATOR" BY THE PUSSYCAT DOLLS Lady Gaga

cranked out hit after hit, and not just for herself. She penned this PCD tune in 2008 under her non-stage name, Stefani Germanotta.