Are Robert Pattinson and Kristen Stewart Appearing in Katy Perry's 3-D Flick?!

It's a teenage dream for all you loyal Robsten lovers! 'Cause Robert Pattinson and Kristen Stewart were in up smoke on the set of Katy Perry's movie Monday night in Hollywood...

Source: http://www.zimbio.com/Robert+Pattinson/articles/Eg8Rl6PXOUi/Robert+Pattinson+Kristen+Stewart+Appearing

Alexa Rae Alexander Korda Alexander Mackendrick Alexander Payne