Wilmer Valderrama

From Gwen Stefani to Miley Cyrus and John Mayer, these pop stars have written breakup songs about other famous people.

The song appears on her upcoming album.

'She realized he wasn't going to be her life partner and she's known that for a while.'

The exes could not stop gushing over one another.

Henry Levy isn't the only man in Demi's life helping her after rehab.

A new 'Us Weekly' story seems to imply as much.