Check please!

J.Lo and A-Rod hit up Craig's for a romantic dinner date last night, but they got quite the surprise when they realized her ex Casper Smart was also dining there at the same time!

Jenny from the Block and the backup dancer dated on-and-off for over five years before she moved on with the MLB legend, so it had to have been a little awkward.

Ever cool under pressure, the Bronx-born beauty didn't let on that anything was wrong as they exited the eatery, even when paps asked her if she was uncomfortable with the run-in!

If this didn't make the baseball slugger want to put a ring on it, we don't know what will!