Posing in front of a wall of lipstick kisses, Lovato added her own smooch, Tweeting, "X's amp O's."
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Simpsonshowed the love – to her Hermès Birkin bag, a birthday present from fiancé Eric Johnson. "Jackie O who?" she quipped.
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Animal lover Bell – she of the infamous sloth freak-out – got some serious face time with The Hangover 2's furry star at the film's premiere. "There are a lot of things I regret about last night. This isn't one of them," she joked.