Diego Boneta keeps it cool with Tom Cruise on the black carpet premiere of Rock of Ages held at Grauman’s Chinese Theatre on Friday night (June 8) in Hollywood.

The 21-year-old actor opened up to Collider about working alongside on-screen love interest Julianne Hough.

“During our five-week preparation and rehearsal…The best way to describe that is it’s a rock star college. That’s truly what it was. The best vocal coaches, the best choreographers, Mia Michaels is a legend in her world. Eric Jackson was teaching us how to play guitar, and we really had time to get to know each other.”

Diego added, “We really became great friends. I know that I can count on her, as a friend, independently of what we did together. She’s awesome.”

10+ pics inside…