Uh oh, poor Justin Bieber is probably going to be left off this list!

Selena Gomez’s 21st birthday might not be until July 22nd, but planning is already underway.

And considering the wild nights she’s been having, this birthday party is bound to be B.I.G.!

Unfortunately, that means it will probably be another "worst birthday" for Justin! LOLz!

The newly single superstar has already told her friends to save the date for the day she’s finally legally able to drink alcohol.

Bottoms up!!