While accepting the prize at the Nokia Theatre in Los Angeles Sunday, Poulter joked about having started a relationship with both his costars after the film.
"In movie sets often actors hook up, really it happens," he said. "Me, Jen and Emma we're so happy together. But dating two women is hard."
After explaining that he's managed to "cope" with dating both Aniston and Roberts he paused his speech to read a text he'd just received from the Friends star.
"Hey douche, I'm watching this on TV. Stop telling people we're a real thing," Aniston's supposed text read. "I was forced to kiss you. I didn't come tonight because I thought I might have to come near you again. It's probably best you stay in England. P.S. You look like a dorky Tintin."
We're the Millers stars Poulter, Aniston, Roberts and Jason Sudeikis as a fake family who tries to move a marijuana shipment into the U.S. from Mexico. The film came out in August 2013.
You can check out Poulter's comedic speech, and the kiss scene, below.