Music stars like Leona Lewis, Adam Lambert and Katharine McPhee also join Cowell's family to honor the music mogul at the Walk of Fame ceremony.

Friends and Business Partners
WENN/FayesVision

Simon's fellow "America's Got Talent" judges Heidi Klum, Howie Mandel and Mel B were all smiles while posing with the honoree. In his speech, Cowell said of celebs who came to the ceremony, "What I am most proud about is that we have become friends as well as business partners."

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