The 21-year-old 'Spring Breakers' star, who was earlier managed by her mother Mandy Teefey and stepfather Brian Teefey, signed with WME as well as Brillstein for managing her career, said the Hollywood Reporter.
Gomez is seeking to move past her teen idol image and apparently wants to do more adult-oriented fare in film and music.
Gomez's upcoming movie 'Behaving Badly' is slated to release on September 5.