This summer’s hit romantic comedy “Knocked Up” is credited by many as having upped Katherine Heigl’s celebrity status but the actress does not falter as she tells Vanity Fair’s January issue that women’s portrayal in the Judd Apatow comedy was “a little sexist.”

Katharine Heigl on Judd Apatow’s “Knocked Up”: “It paints the women as shrews, as humorless and uptight, and it paints the men as lovable, goofy, fun-loving guys.”

Although “ninety-eight percent of the time it was an amazing experience,” the 29-year-old actress says, “it was hard for me to love the movie.”

Her words come as a surprise because the romantic comedy, released in June, was a great box office success, grossing more than $140 million to date. In the film, Heigl played Alison, a young career-oriented woman who finds herself derailed by a one-night stand that results in pregnancy… with a goofy slacker she would not have looked at twice in a less inebriated mood.

That character is not the only one to have left her with mixed feelings. This season’s plot on “Grey’s Anatomy” sees Dr. Izzie Stevens begin an affair with her married friend Dr. George O’Malley (T. R. Knight).

“I don’t really know Izzie very well right now,” she admits. “(The affair) was kind of a big change for Izzie, wasn’t it, after she was so up on her moral high ground . . . I have a really hard time with that kind of thing . . . I’m trying to figure her out and keep her real.”

While her job may be troubling her a bit at the moment, her personal life is a source of contentment. Heigl, raised a Mormon, is engaged to musician Josh Kelley and she confesses their relationship abides to certain moral principles.

“I didn’t want to live together before we were married. I still have enough Mormon in me - not a lot, but enough - that I wanted to keep that little bit sacred.”

She also confesses she did everything differently with Kelley and is happier for it. “I’m not really a first-move kind of gal,” she says. “I’m one of those women who always thinks it’s better to play it cool and keep them wanting more, but I really threw myself at him. I broke all the rules.”

This does not keep her from considering marriage a “crapshoot.”

“The odds are really bad, especially in this town. But I have a lot of faith in Josh, and I wanted to have that one day when I stand in front of my friends and my family and honor him and how important he is in my life. My career is really important to me, but there have to be other great, important things in your life besides work.”

Vanity Fair hits newsstands Dec. 11.