Alba jealous of Bundchen's post-baby body

Actress Jessica Alba fears she'll never get her pre-mommy body back and she can't understand how other celebrity moms lose their baby weight.

"The Fantastic Four" star, who gave birth to baby Honor in 2008, is expecting a second child later this summer, and she worries she has another battle ahead to drop the pounds.

And Alba admits she's still having a hard time accepting that someone like supermodel Gisele Bundchen can drop the pregnancy pounds and flawlessly flaunt a bikini in a matter of weeks after giving birth.

She tells America's Allure magazine, "I can't ever get down to the weight I was before I had Honor... My body's just different. The jeans just sort of zip up differently, and things hang differently. It's a miracle what happens, but you definitely are different afterward. Unless you're Gisele."

However, Alba insists pregnancy has had at least one positive effect on her body - she's now more comfortable with her own sexuality.

She adds, "It wasn't something I embraced until I had my daughter. I saw how incredible and amazing it is to be a woman and to be able to create a life. There's a reason why certain areas of the body are desirable - because it all leads to reproduction."