Sexy Pictures of Heidi Klum

Happy birthday, Heidi Klum! Heidi turns 39 years old today, marking another year of serious sexiness. The model has been flaunting her hot figure on the runway and in front of the cameras since she was discovered in 1992 and it doesn't look like she's slowing down. Heidi shows off her bikini body on vacation and continues to heat up red carpets around the world.

Click through as we take a look at some of Heidi's steamiest shots to celebrate her birthday.