Jessica Alba’s “ASS has got bigger by the second” since becoming pregnant.

The ‘Fantastic Four’ actress – who is expecting her first child with fiancé Cash Warren – says despite her ever-expanding derriere she is having the “best time ever”.

Alba said: “When you’re pregnant, your breasts are engorged and your stomach is getting bigger. And the ass, too, that is getting bigger by the second!

“But it’s awesome. It’s the best time ever. I have two movies coming out, a baby, a fiancé – everything.”

Jessica, 26, is currently taking a break from acting but hopes to get back in front of the camera before the baby is born.

She said: “I don’t know if anyone wants me in their movies when I’m six months pregnant.  Soon, I’ll get the fire and I’ll want to work again, but right now it’s a time to relax and sit back.”

Jessica also revealed she is taking her mind off the downsides of being pregnant by focusing on a domestic project.