California - Heidi Klum, pregnant with her fourth child, drops her three kids off at a martial arts center in Los Angeles, California on September 22, 2009 where they take classes. Seen here with daughter, Leni Klum.

Oh my, martial arts is like hitting two birds in one stone. Heidi's kids will learn about self defense, and going fit at the same time. But before that, I like to say that I really love Heidi's maternity outfit, so fab! Or she's just beautiful?