Blac Chyna's not waiting for Memorial Day weekend to show off her patriotism ... or her bountiful booty.

It's safe to say BC's feeling confident with her post-baby bod, flaunting a thong swimsuit on a yacht in Miami for a photo shoot. She brought along Old Glory for some of the shots, because ... 'Merica!

Chyna also got to ride around on a jet ski during the shoot. Not a bad follow-up gig to judging a twerk contest.

Dream's mama is living her life.