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Kristen Stewart, Robert Pattinson, Toni Trucks

Kevin Winter, Alberto E. Rodriguez/Getty Images

Kristen Stewart is very easy on the eyes.

"Kristen is porcelain—and magnetic," Breaking Dawn: Part 2 actress Toni Trucks said at last night's premiere of her new movie, Ruby Sparks. "I even found myself on set with her and all of a sudden I'd be like, 'Why am I staring at Kristen right now?'"

And K.Stew, 22, and her beau Robert Pattinson, 26, couldn't have been nicer.

"They're great," said Trucks, 31. "Kristen was always lovely to me and really laid back and Rob was so joyful and cool. They're both wonderful, cool as a cucumber. I don't think anyone can really judge people too harshly when you have all eyes on you at all times."

Trucks plays Mary, a vampire who is enlisted by the Cullens to help protect Edward and Bella's daughter, Renesme.

She had to wear hand-painted red contacts. "One day, for whatever reason, they wanted to change the solution we were using," Trucks said. "They thought they'd freshen it up, but it ended up like Contagion. Everyone put their contacts in and then all of a sudden we were crying, 'Ah, my eyes.' It was like wildfire."

Fortunately, no one was seriously hurt.