Blair and 5-month-old son Arthur laugh it up in Beverly Hills. Plus: Russell Brand, Rihanna, Katy Perry and more
Credit: Splash News Online
Updated: Tuesday Jan 17, 2012 | 05:00 PM EST
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Will Ferrell plays it for laughs on the set of his new movie Dog Fight in New Orleans, La, on Monday. The funnyman stars as a South Carolina politician who decides to run for President.
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