Bella Thorne: 'City of Bones' Beauty

Bella Thorne is all smiles at the premiere of The Mortal Instruments: City of Bones held at the ArcLight Cinemas Cinerama Dome in Hollywood on Monday night (August 12).

The 15-year-old actress dolled up in an Alexander McQueen dress and Christian Louboutin heels.

PHOTOS: Check out the latest pics of Bella Thorne

“I am obsessed with @lilycollins and can’t wait for mortal instruments! she is also the sweetest girl ever #twinsies,” Bella wrote on Twitter just the day before at the 2013 Teen Choice Awards.

10+ pics inside of Bella Thorne…