When things get out of hand after a wedding party

They look similar enough to me. The second pic has different lighting, different angle, different expression, and her face is partially blocked. If it's a different girl, then this pic got even wilder than I'd first thought

Looking again- I think these pictures might be taken far apart- possibly “progress pictures” of some sort. The woman’s face seems fuller in the first shot- and she seems (could be posture etc... but I think it is not,) to have a bit of a belly. Perhaps the second pic was taken showing how much smaller she is (hence the showing off the midriff and the thinner face and smaller breasts) and the guy is wearing her clothes to show that she can now fit his skinnier clothes and her dress fits him? I dunnoh. A thought.

She might’ve even been pregnant cause she’s got her hand on her belly

Astute- and very possible. Like they took a “while pregnant” and “X months after..” type photo. Not super uncommon.