Robert Pattinson, Kristen Stewart Spotted On Katy Perry Movie Set

Every day a multitude of stars wander through the halls of MTV News to talk about their latest projects and goof around with staff members. But sometimes we catch stars elsewhere, and that's why we put together Spotted!, a daily compendium of stars in the wild.

Holy smokes! On- and off-screen loves Robert Pattinson and Kristen Stewart were spotted in an L.A. back alley Monday night, puffing on a few cigarettes with friends. Par for the course, right? Well, reports indicate that the "Twilight" twosome were taking a break from...the set of Katy Perry's upcoming movie "Katy Perry: Part of Me 3D"!

The question is: Were Rob and Kristen just visiting their singer pal while she worked, or should we—fingers crossed!—expect a sparkling cameo in the rock doc? While the bulk of "Part of Me" footage will likely come from Katy's last tour, it stands to reason producers might need to film a few pick-up shots and/or confessionals here and there. (Maybe Katy read our advice about including famous friends in the film...)

Regardless, the cute couple have pretty packed movie schedules this year. Kristen will soon ramp up promotion for "Snow White and the Huntsman" and "On the Road," while Rob will keep busy supporting "Bel Ami" and "Cosmopolis." And, of course, the pair will hit the publicity trail together in November for the long-awaited "Twilight" finale "Breaking Dawn - Part 2."

Click on the image above to see even more images of Robsten in our Spotted! gallery.

Do you hope Rob and Kristen are somehow involved with Katy's movie? Tell us what you think in the comments and on Twitter!