05/28/2010 05:12 am ET Updated May 25, 2011

Jennifer Aniston & Gerard Butler Cozy Up In Paris

Jennifer Aniston and Gerard Butler are embracing the joie de vivre that Paris has to offer.

In town to promote The Bounty Hunter, the costars enjoyed a private river cruise on the Seine Saturday evening. Though the single stars have denied romance rumors, a source tells PEOPLE they looked as friendly and flirty as ever on their boat ride. "They were very close," the source says. "They really warmed up the room."

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