The singer stopped by 'Watch What Happens Live' on Sunday.
A source tells ET that Justin and Selena actually recorded the duet 3 years ago "for fun."
This trio of pop stars can't get enough of each other's music.
The entertainer shared her secrets to Lilly Singh on YouTube.
The 23-year-old played a hilarious game of Dubsmash with Jimmy Fallon.
It turns out the 23-year-old singer can lip-sync to Liam Neeson like a pro.
Plus, her words of kindness for haters.
The former Disney star gets candid about her relationship with model Cara Delevingne.
The former Disney star says she 'absolutely' has questioned her sexuality in a new interview.
Calvin Harris took to Twitter Monday after rumors swirled he cheated on Taylor Swift at a Thai massage parlor.
The star also commented on the sexuality of fellow former Disney darling Demi Lovato and Miley Cyrus
The "Good For You" singer says she has a "very healthy perspective" on her sexuality.
The "Good For You" singer proves she's stronger than ever.
"Yeah, it was the first time I'd ever been called fat."
