Heidi Klum can barely keep her clothes on -- no but really.

The Klumster has ONCE AGAIN bared her bod for social media -- this time to promote her popular Lifetime show, Project Runway.

This time, designer and Proj Run aided and abetted her need for attention ... using his hands to cover the German beauty's nips.

Along with the snap, the mother of four wrote, "@zac_posen ....I need something to wear for tonight's @projectrunway @lifetimetv."

We get it Heidi -- you have an amazing body. Can you maybe just go a couple of weeks without posting any topless shots? We get that you are loud and proud about your sleek physique -- but we're getting over-saturated. "Oh Heidi Klum put up another topless pic on Instagram?" That's like saying, "Oh ya hear? Chris Brown got arrested again." What's new?

Okay maybe we're being a bit harsh, we may just be a tad bit just jealous ...