Billy Unger & Kelli Berglund: 'John Carter' Premiere!

Kelli Berglund hits the red carpet in a chic black Betsey Johnson dress at the premiere of John Carter held at Regal Cinemas L.A. Live on Wednesday night (February 22) in Los Angeles.

The Lab Rats actress was joined on the carpet by her costars Tyrel Jackson Williams, Billy Unger and Spencer Boldman.

The new series, which premieres MONDAY, introduces Leo (Williams) to three experiments, super-human teens: Adam (Boldman) the strong one, Bree (Berglund) the fast one and Chase (Unger) the smart one after his mom marries inventor, Donald Davenport.

Check out your first clip below and stay tuned over the weekend for quotes from the cast! 15+ pics inside…

FYI: Kelli completed her look with Chinese Laundry shoes and Forever 21 accessories.