Julia Roberts and co-star Lily Collins were all sorts of glamorous on Saturday, as the actresses attended the world premiere of their new film, Mirror Mirror in Hollywood.

Roberts, 44, donned a black pantsuit and pink blouse, while Collins, sparkled in a Dolce & Gabbanna dress.

The cast finished the evening at the Roosevelt Hotel, with a special apple birthday cake to celebrate Collins' 24th birthday.

Mirror Mirror, one of two Snow White films coming out this year, is directed by Tarsem Singh (Immortals), starring Collins as the raven-haired princess. The other Snow White film, Snow White and the Huntsman, stars Twilight alum Kristen Stewart.

It's funny, I mean, they are so different, they couldn't be more different . . . Kristen and I have laughed about the fact that we're apparently 'rivals.' And it's just funny to us . . . I think that people are going to get different things out of each one, Collins (daughter of Phil) told Access Hollywood in a recent interview.

Roberts plays the evil queen in Mirror Mirror.

My version of the evil queen is just a lunatic, which is fun, Roberts recently told ABC News.

Mirror Mirror, also starring Armie Hammer (as the handsome prince) and Sean Bean (as King), opens Mar. 30.

Click through for photos from Saturday's world premiere in Hollywood.