Ashlee Simpson-Wentz celebrated her 24th birthday with a 'white trash-themed' bash on Friday.The singer, her husband Pete Wentz, sister Jessica, parents and pals all dressed up for the party at the Simpson family's Encino home.A guest reveals; "It had a white-trash theme. Ashlee wore Daisy Dukes and platform flip-flops with a bathing suit and a fake tattoo around her belly."(Father) Joe wore a cut-off muscle T-shirt and a mullet wig. It was funny. Jessica was wearing a crazy leopard-print dress that showed off a lot of cleavage."Simpson-Wentz is due to give birth to her first child next month.

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