Los Angeles, May 7 : Actress Jessica Alba won't bare all on-screen because she doesn't want her grandparents to see her in the buff.

Even though the 33-year-old reprises her role as stripper Nancy Callahan in the much-anticipated sequel “Sin City: A Dame To Kill For”, audiences will not see her bare all.

This is due to a no-nudity clause Alba adds to her contract when signing on to star in a movie, reports contactmusic. com.

The actress explained her reasons in the June issue of Glamour magazine, in which she showed hardly any flesh when featuring on the front cover.

"I don't want my grandparents to see my b***s. That's it. It would be weird at Christmas. And, I mean, really, if you look at the movies I have done, getting naked would never 'elevate' the picture,” she said.(IANS)