Sexy XXXXS model

Heidi Klum wears the smallest bikini bottoms in the world

In summer, Heidi Klum famously lets very little fabric touch her sexy curves. So it's no wonder that the latest bikini model, with which the 51-year-old has now presented herself on Instagram, is once again forbiddingly small!

In her latest Instagram clip, Heidi Klum presented herself in a lace-up bikini in a class of its own. The provocative leo-look piece is not only artfully wrapped around the 51-year-old's mega body. The panties in particular don't seem to be any skimpier.

Heidi wears XXXXS bikini bottoms 
The XXXXS model that Klum chose only just covers the bare minimum at the crotch. But that doesn't seem to worry the model beauty, because she's worried about something else entirely.

In the commentary to the sexy clip, Klum wrote: "Beach time ... not sure about the tan lines later."

Not a fan of tan lines
As the "Germany's Next Topmodel" presenter has already admitted in the past, she is not a fan of tan lines, which is why she prefers to worship the sun topless on the beach and by the pool. 

Incidentally, Heidi is currently celebrating her fifth wedding anniversary with husband Tom Kaulitz in a vacation paradise. And the 51-year-old proved that things can be even more revealing than you can see in her latest video with her hot declarations of love on her wedding anniversary ...