The two are caught joking and smoking on the set of their newest film together -- find out what they're working on!
and Kristen Stewart
were spotted in Los Angeles on March 26 -- and fans will be shocked to know they were filming a new movie together!
Rob, 25, and K-Stew, 21, were at a Katy Perry
concert at The Hotel Cafe
, which is reportedly being filmed to be a part of her new concert movie Katy Perry: Part of Me
"It was just organic and they were all aware the cameras were going to be there. So they were comfortable when it happened," an insider tells HollywoodLife
But the insider added they weren't filmed while they were watching the concert -- just outside when they were talking about the show!
Are YOU shocked that Rob and K-Stew are in a new movie together, HollywoodLifers
(Pacific Coast News)