celebrated her 21st birthday
by going to a movie with friends and then partying the night away!
, accompanied by some pals, first went to an early showing of Tyler Perry
's Madea Goes to Jail
in Santa Monica" an eyewitness tells Life & Style
. "She looked beautiful. She was wearing glasses, so you couldn't see her eyes, but she looked fine to me. "
After the movie, Rihanna
hit up the