You'll Never Guess Who Sang Backup Vocals on ''FourFiveSeconds''!

You hear "FourFiveSeconds" on the radio all the time, but you probably didn't realize there are more famous voices on that track besides Kanye West, Paul McCartney and Rihanna.

It was just revealed that one particularly famous group lent their voices for the backup vocals of the song after gaining some praise from Yeezy. Can you take a guess as to who it is?

Nope, it's Wendy Wilson, Chynna Phillips & Carnie Wilson, otherwise known as Wilson Phillips!

"[Kanye West] said, ‘When I think of authenticity and I think of angelic, I think of you,'" Carnie told Billboard. "He was really shy and he would just smile and he's real soft-spoken, then all of a sudden when he started playing all these songs, he was dancing around the room," she continues.

"It was just like how Michael Jackson used to be. When he would press play, it was like, out came the artist and the creativity was just really there."

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