Jessica Alba said her character in “Frank Miller’s Sin City: A Dame to Kill For” doesn’t have anything in common with her as a “prude” mother of two in an interview with Entertainment Weekly.

Jessica claims she doesn’t understand her sex symbol reputation and is much more modest off screen, despite the fact that she is best known for parts that play up her physical endowments.

Jessica tells the magazine, “I never slept my way through Hollywood, so I never felt like I compromised.”

“Apparently people do it. I didn’t. I felt like I never compromised myself because I’m a prude. I don’t know. I grew up Catholic. In my head I’m always thinking, ‘Oh God, can my grandma see this?’ ”

Jessica, on the other hand, doesn’t mind wearing revealing clothing on film if it serves her character’s needs, such as when she played stripper Nancy Callahan in Sin City: A Dame to Kill For.

“Sex is absolutely what helps sell this movie, which is fine with me,” the actress, 33, continued. “I’m also playing a character when people are taking pictures of me. That’s what I do, but it is not who I am.”

Alba reveals that she used to become irritated when reporters brought up her alluring beauty during her early days in Hollywood.

“I didn’t have a lot of experience, so at first it was all kinds of weird,” admits the mother of two, who rose to fame as the lead of Fox’s Dark Angel before moving on to films. “They would always ask me provocative questions about my sexuality, my this or that.”

Jessica acknowledged to lying in interviews to make herself appear more sexy.

She said: ‘I didn’t really understand. [Interviewers] would always ask me provocative questions about my sexuality, my this or that.

‘Sometimes I would lie and say something that wasn’t true to make myself seem more interesting than I was. I mean, I didn’t even know how to walk in heels until I went to the Golden Globes for the first time.’

Jessica, who began her acting career at the age of 13 before landing her big break in 1995 with the remake of the TV series ‘Flipper,’ has two daughters with husband Cash Warren, Honor, five, and Haven, two, who she says have changed her attitude toward her diet and made her stop trying to be “perfect” because she wants to set a good example for her children.

She said: “As I’ve gotten older and after I became a mom, it became more of a priority to be healthy for the right reasons. It’s more important to have a balanced approach instead of trying to be perfect.”

“Frank Miller’s Sin City: A Dame to Kill For,” the actress’ next film, will be released in theaters on August 22.