Ashley Tisdale, 25

Starred in proto-“Glee” Disney Channel franchise “High School Musical.” Went public with her nose job, which we respect. Hard to distinguish from Haylie Duff, sister of fellow Disney channel alumna Hilary, but that might change soon. Ms.Tisdale was recently cast in the pilot of Louis C.K.’s CBS sitcom.

Emblematic Tweet: @AshleyTisdale: Can’t believe I dragged my butt to the gym in this rain…

Conspiracy theory: Disney still retains her services as undercover babysitter, to make sure Mr. Bieber doesn’t knock up Ms. Gomez.