Heidi Klum: B-Day Celebration with Martin Kirsten and the Kids!

Heidi Klum rocks a festive triple-tiered top hat for her 40th birthday lunch with boyfriend Martin Kirsten held at the Hotel Bel-Air on Saturday (June 1) in Bel Air, Calif.

That same day, the America’s Got Talent judge was joined by her children Leni, Johan, Henry, and Lou, as they grabbed breakfast in Brentwood.

PHOTOS: Check out the latest pics of Heidi Klum

“I’m 40! Look what I got from my 4 beautiful children,” Heidi shared on her Twitter along with a pic. “Thanks everyone for all the wishes, flowers, balloons & gifts.”

Also pictured: Heidi spotted arriving at LAX Airport on Friday (May 31).

15+ pictures inside of Heidi Klum out and about for her 40th birthday…