The actress is up and running with costar Goran Visnjic at the Las Vegas debut. Plus: Jessica Simpson, Nick Lachey, Renée Zellweger and more

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Avril Lavigne convenes with her fans (while her boyfriend, Sum 41 frontman Deryck Whibley, looks ready to call it a night) outside hip Beverly Hills club Prey on Thursday. The singer is also doing her part for the tsunami-relief effort: She'll perform with fellow Canadians Sarah McLachlan and Barenaked Ladies at a Jan. 29 benefit concert in Vancouver.