Think you've seen all of Miley's craziest antics already? Just wait until she's legal! The young singer/twerker will be turning 21 on Saturday, and we can only imagine the party she is planning to throw.
The following day, MTV plans to dedicate eight hours of programming this week to the former "Hannah Montana" star.
Check out the gallery above of other young stars who also turned 21 this year and see how they celebrated!