Couples Watch - Joel Madden, Nicole Richie : People.com

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from the Beach Boys to Justin Timberlake. The couple "were just chilling in the club downstairs with everyone else," a source tells PEOPLE. ? Mario

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and girlfriend Kate Middleton, sampling exotic drinks with pals (including William's stepbrother Tom Parker Bowles and his wife) at hot new bar and club

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hung out with Paris Hilton. Also making the scene: Lindsay Lohan, Kate Hudson, Matthew Perry and James Franco. ? Sandra Bullock and husband Jesse James
: Lindsay Lohan and Alicia Silverstone, who kissed musician husband Christopher Jarecki under the mistletoe. ? New parents Maggie Gyllenhaal and husband

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, looking "adorable together and holding hands" at L.A. eatery The Ivy. They dined on fried calamari and lime chicken. ? Naomi Watts and boyfriend Liev

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: Lindsay Lohan and Alicia Silverstone, who kissed musician husband Christopher Jarecki under the mistletoe. ? New parents Maggie Gyllenhaal and husband

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hung out with Paris Hilton. Also making the scene: Lindsay Lohan, Kate Hudson, Matthew Perry and James Franco. ? Sandra Bullock and husband Jesse James

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hung out with Paris Hilton. Also making the scene: Lindsay Lohan, Kate Hudson, Matthew Perry and James Franco. ? Sandra Bullock and husband Jesse James

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couldn't help but giggle as the smoke drifted toward Peter." Karina Smirnoff and Mario Lopez Sthanlee B Mirador / Shooting Star ? Prince William

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