Marc Jacobs st. barts tattoo shorts designer dog Marc Jacobs st. barts tattoo shorts designer dog

Well, we're not sure what's going on with Marc Jacobs and former fiance Lorenzo Martone, but clearly the two are friendly enough to be on vacation in St. Barth together!

The duo walked their dogs on the beach on Monday afternoon, and while Marc has been known to show off his tattoed bod in a wide variety of ensembles, he kept his fashion on the conservative side when these pics were snapped.

Aw, take off that tee and show us your abs, MJ! We know you're hiding a hot bod under there...