Jessica Alba
Credit: Dominique Charriau/WireImage

Jessica Alba won’t do nude scenes for one simple reason: “I don’t want my grandparents to see my boobs.”

The Sin City 2 star covers the latest issue of Glamour. In the accompanying interview, she talks about how her kids inspired her to found The Honest Company — which sells toxin-free baby-care essentials — as well as her “no boobs” rule.

Really, Alba just wants to avoid any awkwardness. “It would be weird at Christmas,” she explains. “And, I mean, really, if you look at the movies I have done, getting naked would never ‘elevate’ the picture.” Something tells me anyone who sat through Good Luck Chuck or The Love Guru might disagree.

Read Alba’s full Glamour interview when the magazine hits stands May 13.