IT’S “OH BOY!” FOR BEN AFFLECK

 If I were a betting man, I’d put money on the stork bringing BEN AFFLECK and JENNIFER GARNER a new baby BOY!

Yep, after years of hearing Ben complain that there’s far too much estrogen in his household (two daughters + one wife), it looks like his dream of being dad to a lad’s coming true.

WHY?

My SpyWitness spotted baby-bump Jen power-shopping at trendy LA kid boutique Poppy, and reports: “Everything she purchased was blue! The cutest blue onesies, blue baby blankets, blue bibs, T-shirts, hoodies – even blue baby jeans.”

But mum was the word for mum Jennifer!

She got all coy when the salesbabe at the register asked: “So – is it a boy?”

Refusing to reveal her secret, the star just flashed that famous smile and said: “Could be!”