Two of Gisele Bündchen's exes walk onto a yacht ...
There's no joke here, but that's exactly what went down in Sardinia over the weekend ... with Tom Brady and Leonardo DiCaprio hanging out on a big boat together.
As we previously reported, the "Departed" actor has been yacht hopping for about a week following the Cannes Film Festival ... most recently ditching his shirt to hang with his guy friends out on the waters near the Italian island.