Mindless Behavior rock out the stage at Universal CityWalk on Thursday afternoon (September 22) in Universal City, Calif.

After the performance, the guys — Princeton, Prodigy, Ray Ray and Roc Royal — slipped inside the Hard Rock Cafe to meet, greet and sign autographs for fans. The guys even had a few celeb fans — Madison Pettis and Alli Simpson!

Mindless Behavior recently spoke with SingersRoom.com about their new album, #1 Girl.

“There was a lot of sacrifice,” Princeton shared. “Late hours in the studio after doing hours of homework and other things that we had to do but we knew that if we put in the hard work now that the fans are gonna put their hard work into buying it, coming to the in stores; just supporting us.”

25+ pics inside…