One Direction's Liam Payne's GF Expecting?

Liam Payne is either about to be a dad, or his gf had way too much food and beer before enjoying Christmas carols.

The 23-year-old One Direction singer and Cheryl Cole, from Girls Aloud, showed up together Tuesday at the St James Christmas Carol Concert in London -- and it sure looks like something's in the oven.

The couple isn't commenting yet about the baby rumors ... or about what she had for dinner.