Christina Milian and Karrueche Tran Eat Burgers in Their Bikinis

Christina Milian and Karrueche Tran are a little late to get on the "hot babes eating burgers" train ... but that doesn't mean we don't appreciate the effort.

Christina and Karrueche got their bikinis on and hit the beach Tuesday in Miami, where at first they got all wet ... and then dried off and chowed down on some cow.

Their burger bikini fest wasn't for any type of Carl's Jr. commercial -- in fact, the company ditched that whole concept earlier this year ... sad as it may be.

Still ... it's good to see an homage here to the good ol' days -- intended or not.

Don't bother them, they're eating.