Model-turned-actress Rebecca Romijn has urged Hugh Hefner and the editors of Playboy magazine to stop asking her to bare all for the publication, insisting she'll never do it.

The mom of twin girls, who bared almost all as blue mutant Mystique in the X-Men movies and steamed up the screen in sexy thriller Femme Fatale, admits she has fielded a lot of offers to strip for Playboy, but she insists it's not something she would ever consider.

She tells the new issue of Fitness magazine, "I don't want to dis (sic) the magazine or the beautiful women in it - some of whom are my friends - but I would never do it.

"And now that I'm a mom of two girls, I definitely would never go that route. Maybe it's the turtleneck and long johns-wearing girl in me who likes to be covered up, but I'll always say no."