"Kevin Nealon is my husband," Heidi told Jay Leno during Friday's "Tonight Show" of her on-screen love interest, played by the former "Saturday Night Live" funnyman. "And he's had more surgery than I have in the movie, so we kept playing around with who has more injections."
In fact, Kevin recently Tweeted a photo of his "Just Go With It" look, showing the "Weeds" star with an almost unrecognizable face.
Heidi told Jay that she acquired the part in the film, which also stars Jennifer Aniston, Nicole Kidman and Sports Illustrated cover star Brooklyn Decker, through a phone call.
"They just called me and they said, 'We'd love to have you,'" she said.
"The Hills" star, who recently recorded a public service announcement about paying for plastic surgery with plastic on FunnyOrDie.com — a clip directed by Oscar winner Ron Howard — revealed she actually hasn't had to try out for any of the parts she has secured thus far.
"That God I haven't had to audition yet," she said.
When Jay asked if she could handle rejection, Heidi, who underwent 10 plastic surgery procedures in one day in late 2009, joked that being turned down for a role could lead her to going under the knife again.
"I don't know. I might have to get more surgery if they rejected me," she said. "No, I'm just kidding."
But Heidi told Jay she has reached a good plastic surgery stopping point – for now.
"I've reached the point. I think I'm good for a while. I'm surgery'd out," she said.
As for working with Ron on that FunnyOrDie clip, Heidi said it's made her want to re-do some of the movies he is famous for.
"Actually, I'm the biggest fan of Ron Howard. 'Splash' is one my favorite[s]. I'm telling him I want to do the remake…I wanna be the mermaid," she said, referring to the role that helped make a young Daryl Hannah a household name back in 1984 . "I think I could play her pretty well, you know. So I think I wanna do that. And, 'Willow.' And I loved 'Willow.'"
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