Actress Jessica Alba insists her pregnancy was no "accident" - because she and fiance Cash Warren failed to practice safe sex.

The star - who is expected to give birth to her first child next month - never predicted she would be pregnant at the age of 27, but she openly admits she wasn't being "careful" with contraception.

She tells America's Allure magazine, "I can't say it was a total accident. Because you're aware of when you're being careful and when you're not. It just happened so soon."

"I never believed women had to be virgins when they got married, or that a woman has to fall in love with a guy just because they're having sex. I don't think sex is a big deal."