AJ Michalka looks wonderful in a Robert Rodriguez black dress as she arrives at the premiere of I Am Number Four held at the Village Theater in Westwood, Calif., on Wednesday night (February 9).

The 19-year-old actress, wearing Ursula Mascaro heels, came out to support good friend Alex Pettyfer, who is the star of the flick.

AJ just returned from Vancouver where she filmed a guest spot on Hellcats, opposite big sis Aly.

Psst, did you catch the teaser trailer for AJ‘s upcoming film, Super 8?

10+ pics inside of AJ Michalka…