Warner Bros. Christina Applegate and Ed Helms, who costarred in 2015'sVacation, shared that they were "obsessed" with Chris Hemsworth when he filmed a cameo in the comedy During an appearance on Christina and Jamie-Lynn Sigler'sMesSypodcast on Aug. 12, Christina said she and Ed "didn't understand his physique" They raved about him being the "chillest, coolest dude," but admitted he's so "sculpted" that "it looks fake" Christina ApplegateandEd Helmssaid that they couldn't stop staring atChris Hemsworthwhen he filmed a cameo in their 2015 update ofVacation,saying he's so ripped "it looks fake." "You and I didn't stop talking about Chris Hemsworth for days," Christina, 53, said during Helms' Aug. 12 appearance on her andJamie-Lynn Sigler's podcast,MesSy."I think we were slightly obsessed," she said, sharing, "We would get on the phone and still talk about Chris Hemsworth, and we'd talk about him there on set and after we were done." Hopper Stone/Warner Brothers/Kobal/Shutterstock https://people-app.onelink.me/HNIa/kz7l4cuf Helms, 51, explained that the whole time they were shooting the comedy, "There was this sense of, like, 'Did we getThorto be in our movie? Like, did we actually get him yet?' And then we got him, and it was like, 'Oh my god. Chris Hemsworth's coming! What's he gonna be like? What's Chris Hemsworth like?' And then he shows up. He's the chillest, coolest dude, and he's so psyched to be there." While Applegate and Helms raved about how theSexiest Man Alivealum was game for the movie's bawdy jokes — "he just brought more joy and was ready to play and have fun and be sort of, like, foolish," Helms said. Applegate pointed out, "We marveled at [him] … We didn't understand his physique." "No, you can't," Helms said. "When you look at something like that in front of you," Applegate began. "So sculpted," he said. "It's fake. It looks fake," she said. "Did he eat, like, super clean, or did he eat, like, a doughnut?" Sigler asked. Never miss a story — sign up forPEOPLE's free daily newsletterto stay up-to-date on the best of what PEOPLE has to offer, from celebrity news to compelling human interest stories. Hopper Stone/Warner Brothers/Kobal/Shutterstock "He's working out constantly," Applegate explained. "He was doing, like, full crazy weird workout-y stuff. " "He's a cartoon character. Like, his body is like, drawn by a comic book artist," Helms said. "There's the whole scene where we're gawking at his body. Like, that is the scene, and we weren't acting," Ed explained. "That was an honest reaction." "We're talking about Chris Hemsworth again," Christina said. "We're gonna continue, I'm sure." Read the original article onPeople