Ben & Jennifer: What's Up, Baby Doc?

Are the celebrity couple expecting a sibling for daughter Violet?

The baby buzz on Jennifer Garner and Ben Affleck is getting louder.

Rumors that Garner is expecting the couple's second child were kick-started earlier this month when a tabloid report claimed Garner and Affleck had already told friends their two-and-a-half-year-old daughter Violet is getting a sibling.

Speculation really ramped up when Garner starting wearing loose-fitting tops capable of hiding a growing belly.

Now comes another possible clue...

The two were spotted together Wednesday at an L.A. obstetrician's office to meet with a doctor.

Garner sat in the reception area reading a magazine, but when Affleck arrived, they were almost immediately called in to see the doc.

Reps for Garner and Affleck are not commenting one way or the other.

So we'll just have to wait and see. In other words, let the baby-bump watch continue!