Is it a baby for Ben and Jen?

Is Elektra beauty Jennifer Garner pregnant with boyfriend Ben Affleck's baby? That's the question filling the gossip columns of America's showbiz magazines after pictures showed the star covering up her stomach.

The 13 Going On 30 actress is usually extremely slim and super-fit, but these photos show her with a bigger stomach than usual.

Wearing a long-sleeved t-shirt, the 32-year-old covered her stomach protectively with her hands when she spied a photographer while out with Affleck in Los Angeles earlier this week.

America's Star magazine also reported the brunette wore a long scarf to cover her midriff a day later, although her representatives have refused to confirm whether she is expecting or not.

Daredevil co-stars Affleck and Garner have embarked upon a low-profile relationship since the summer. Ben was previously engaged to diva superstar Jennifer Lopez, who has now married singer Marc Anthony, and Jennifer is divorced from her actor husband Scott Foley.