Demi Lovato

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 had the BEST response.

The new ink proves the pop star is committed to putting herself first.

Our hearts are still breaking for these former couples.

So many stars have had their privacy invaded.

She set the record straight about her relationships with the pop stars.

Demi Lovato's got a major hair makeover.

'I AM MORE THAN MY WEIGHT."

Did your faves make the top five?

The singer reportedly checked herself into a rehabilitation center in Hawaii.