Nicole Richie on Birthday: 'Mrs. Over the Hill'

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She throws a bash at Regent Beverly Wilshire in Beverly Hills to celebrate turning 30.

Nicole Richie turned 30 Wednesday with a bash in a deluxe suite at the Regent Beverly Wilshire in Beverly Hills.

Guests include Lindsay Lohan, DJ Samantha Ronson, Ashley Olsen, producer Quincy Jones (who worked with her father, Lionel Richie), husband Joel Madden and his twin brother, Benji, according to

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"I can't believe the outpour of birthday love I am getting on twitter today!" Richie wrote on Twitter. "From the bottom of my heart (& the top), THANK YOU SO MUCH!"

She joked about about getting old.

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Under a photo posted on her Twitter with husband Joel (with whom she has two children: Harlow, 3, and Sparrow, 2), she wrote, "Mr. & Mrs Over The Hill. #dirty30"