Jennifer Aniston

'She was appreciative and nice, and there's no reason to hate on her,' Nick Swardson tells MTV News.By Eric Ditzian Heidi Montag Photo: Jason LaVeris/ Getty Images "This is one of the best days of my life!!! Getting icecream to celebrate!" Heidi Montag tweeted in March. The cause for sweet celebration was a new job for the "Hills" star — a film role, in fact, albeit more of a cameo, in "Just Go With It," a comedy starring Adam Sandler, Jennifer Aniston and Nicole Kidman. Sandler plays a plastic surgeon who convinces his office manager (Aniston) to pose as his soon-to-be-ex-wife so his younger girlfriend (Brooklyn Decker) won't want to start a serious relationship. Co-star Nick Swardson told MTV News that Montag was very professional on set and that he didn't understand all the Web hate thrown at the reality star after the casting news. "It was funny. They announce that Heidi did this cameo, and people just got so upset," the comedian said. "My buddy said he was on the Internet and saying all these people were furious she did a cameo. But she's super cool. She's really nice." While Montag had tweeted that she would be filming "all week," Swardson said she filmed for just one day, with Spencer Pratt accompanying her to set. "She played Kevin Nealon's wife, and Kevin Nealon has a ton of plastic surgery," Swardson explained. "It's super funny. She did a day, and she was really cool. She was appreciative and nice, and there's no reason to hate on her." "Just Go With It" shot in Los Angeles and Hawaii and marks Sandler's sixth collaboration with director Dennis Dugan ("Grown Ups," "Happy Gilmore"). The film is set for release February 11. Check out everything we've got on "Just Go With It." For breaking news, celebrity columns, humor and more — updated around the clock — visit MTVMoviesBlog.com. Related Photos The Evolution Of: Heidi Montag

Looks like Jennifer Aniston's guest starring role on "Cougar Town" comes with some sweet fringe benefits.