7 Songs You Didn't Know Sia Wrote

For anyone who can’t get "Chandelier" out of their head, it should come as no surprise that Sia is more than just a phenomenal singer -- she's a killer songwriter, too.

The famously press-shy star (did you catch her on Late Night with Seth Meyers? Or on Ellen?) nabbed her first No. 1 album on the Billboard 200 chart this week, but she's been churning out hits for her fellow artists for years. Sure, we remember her voice on David Guetta's "Titanium" and on Flo Rida's "Wild Ones," but did you know that she's written some of Rihanna, Katy Perry and Britney Spears' biggest hits?

In honor of Sia nabbing her first No. 1 album on the Billboard 200 this week, take a look at seven Sia smashes... that she didn't sing.

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"Diamonds" by Rihanna: In an interview with the New York Times, Sia (whose full name is Sia Furler) revealed that she wrote "Diamonds" in just 14 minutes. The song went on to top the Billboard Hot 100.

"Pretty Hurts" by Beyonce: Queen Bey's latest single could have been a Katy Perry song. According to Sia's interview with the NYT, she had originally written "Pretty Hurts" for Perry, but Perry missed her email! The song later went to Rihanna before Beyonce got wind of the track and snapped up the rights to it. After Bey's version gained some traction, Perry sent Sia a text that read: "I'm pretty hurt you never sent me this song." Sia's response? "Check your email."

"Cannonball" by Lea Michele: Sia sat down with Michele shortly after the Glee star lost her boyfriend, Cory Monteith, and ultimately wrote two songs for Michele’s debut album (the second is "If You Say So"). "I just felt that 'Cannonball' was the perfect first song for people to hear from this record," Michele told MTV News. "It just really explains where I am right now and it’s been such an inspirational song for me. It's been such a rock, such a source of strength for me." Sia shares writing credit with Benny Blanco on the song.

"Perfume" by Britney Spears: Spears co-wrote her latest hit with Sia. "I fell in love with the way she looks at life," Spears said of Sia. "There is a bit of darkness somewhere in there, but it doesn't come across in a frightening way." "Let Me Love You" by Ne-Yo: "'Let Me Love You' is that song means a lot to me. That's one of the very few co-writes I’ve ever done," Ne-Yo said in an interview last year. "It was an opportunity for me to step out of my comfort zone for a minute and just really try something new in regards to working with other writers." And yes, he’s definitely a Sia fan. "Her mastery of melody, from just the way that she works, her words and phrases, it's been incredible. And people are just now catching on! Y'all are late; everybody's late. It's been that way."

"Sexercise" by Kylie Minogue: "Sia is executive producer with me, which is amazing and a little dream come true, and there was a certain point on the album where we had countless songs, and she said, 'we need some sex on there...we need a hot song,'" Minogue told Spotify of her latest album, Kiss Me Once. "Next thing I know there's 'Sexy Love', 'Sexercise' and 'Les Sex'! And even looking at the album titles, trying to figure out what makes it on the album, I thought 'I can't really do that', and then I thought 'yeah, I really have to do that because they're all really great songs'. And I couldn't call them anything else, because that's what they are."

"Radioactive" by Rita Ora: Sia shared Ora's video on her Facebook page back in 2012, writing that she was "so proud" of the track and declaring: "Rita Ora SMASHES the vocal!" Sia shares a co-writing credit with producer Greg Kurstin on the track. It went on to be a global hit.

Now trust us when we say to do yourself a favor and go buy Sia's album, 1000 Forms of Fear.

Follow Sophie on Twitter: @SophieSchillaci