Seal, Heidi Klum yacht Saint-Tropez private concert Southern France SealHKlum080110_17-full.jpg

Seal serenaded his family on the deck of a ginormous yacht in St. Tropez over the weekend.

The daddy to Leni, Henry, Johan and little Lou, too, belted it out in front of a large crowd, giving some very lucky boaters a private concert.

Wonder how much he got paid?