"40 is the new 30," Klum said. "I don't really care about aging. I'm happy."
That head was topped with a fabulous hat, as were those of her guests. Klum was joined by her boyfriend, Martin Kristen, and her children for a hat-themed birthday party at the Hotel Bel-Air in Los Angeles, according to the Daily Mail.
"I'm excited," Klum said before the party. "My friend is actually throwing me a party, and it's going to be a hat party. I can't wait!"
Klum wore a three-tiered top hat with a sequined blazer and skinny jeans. Her guests were required to join in the hat fun.
Fun day. Thank you. twitter.com/heidiklum/stat…— Heidi Klum (@heidiklum) June 2, 2013
"It's all girlfriends of mine and everyone has to wear a crazy hat," Klum said. "So we're all going to sit around with some hats on, which I think is fun."
Thank you Nancy for throwing me my 40th birthday party. Love you girls. twitter.com/heidiklum/stat…— Heidi Klum (@heidiklum) June 1, 2013
Before the party, she was spotted with her family for a breakfast run so early her children were still in their pajamas, the Mail wrote.
After that, she opened a present from her children -- a set of hand-painted casts of their hands.
I'm 40! Look what I got from my 4 beautiful children. Thanks everyone for all the wishes, flowers, balloons & gifts twitter.com/heidiklum/stat…— Heidi Klum (@heidiklum) June 1, 2013