Credit: Jason LaVeris/FilmMagic

She doesn't appear in the movie, but that didn't stop Selena Gomez from stealing the spotlight at the premiere of The Thing in Los Angeles on Monday night.

Justin Bieber's girlfriend, 19,  made sure all eyes were on her in a teeny tiny pair of sparkly black shorts, sexy strappy heels and a white floaty top.

The teen heartthrob, 17, recently opened up about his feelings for Gomez. "I wouldn't be with somebody if I wasn't in love," he said in an interview with the British magazine New!. "We are just a young couple, enjoying spending time with each other."