It's hard to believe Heidi Klum was once a beautiful brunette (instead of a beautiful blond) but here she is near the start of her modeling career. Her natural hair color is a light brown.

Heidi was born in 1973 and started her modelling career at the age of 18. Today she's steadily building up a small business empire in TV show hosting and jewelry sales. Her third baby (second with husband Seal) is due to be born any day now. She ditched her previous partner when she was six months pregnant as he was having an affair.

Update: Heidi Klum gave birth to a healthy baby boy, Johan, on November 22nd. He weighed 8 pounds and 11 ounces. Seal said he is beautiful and looks just like his mother.