Heidi Klum Is a Mad Hatter at Her 40th Birthday Party

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Hats off to Heidi Klum on her 40th birthday! The super model turned the big 4-0 on Sunday, and to celebrate, she gathered her closes friends together on Saturday to join her for a crazy hat party. In true Heidi fashion, she went all out for the big event, getting dolled up in a multi-tiered black hat and sequined jacket. She shared several candid pics via Twitter, documenting her fun day and thanking those that helped her put it all together.