Demi Lovato

She joins Jennifer Lopez and Shakira, who are headlining the halftime show.

While some stars were able to recover like a pro, others needed a little help from the audience.

Demi is working on new music!

Check out Demi Lovato's best red carpet looks from over the years.

From Katy Perry to Justin Bieber, here are some of the biggest names who have had beef with pop star Taylor Swift.

The pop star told fans what they can expect from her new album.

So many stars have had their privacy invaded.

And we love them for it!

Check out 15 celebrities who made a dramatic exit from social media.

The pop star recently took to Instagram to call out designers who won't dress her for the Grammys because she's 'too big.'