Kristen Stewart and Robert Pattinson film part for Katy Perry project

Breaking Dawn Part 2 co-stars Kristen Stewart and Robert Pattinson paid Katy Perry a visit during her live intimate performance at a Hollywood Venue on Monday night. They were joined by their mutual friend Raising Hope actress, Shannon Woodward.

Supposedly, Stewart, Pattinson and Woodward attended the private concert to film a part for Katy Perry's upcoming 3D movie, Katy Perry: Part of Me.

Pattinson and company took a break from the performance to have a smoke break. The gang kept it casual Monday night, Pattinson wore jeans, a hoodie, baseball hat and looked as if he hadn't shaved in a while while Stewart wore skinny jeans, Converse, grey t-shirt and jacket and a baseball hat.

The Twilight actors have two seperate projects each coming up this year. Stewart is gearing up for promotion on this summer's blockbuster, Snow White and the Huntsman, she plays Snow White. And, the trailer for long anticipated movie, On The Road, was just released featuring Stewart as MaryLou and her friend Tom Sturridge as Carlo Marx.

Pattinson's trailer Cosmopolis was recently released and showed a much darker side to the Water for Elephants actor. He also has the period piece, Bel Ami, to promote this year.

Together, Stewart and Pattinson will be starring in the last installment of The Twilight Saga: Breaking Dawn Part 2. The teaser trailer for the movie was released in front of The Hunger Games last weekend.

See all the photos of Stewart and Pattinson's night out at Katy Perry over at PattinsonLife.