Back to work in The Heat!

Sandra Bullock braved the scorching temperatures in Boston on Thursday to begin filming her new comedy, fittingly titled The Heat. Unfortunately, the Oscar-winning actress had to dress in warm, business-casual attire for the shoot. 

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The film, directed by Bridesmaids' Paul Feig, is about an FBI agent (Bullock) who teams up with a Boston police officer (Bridesmaids' Melissa McCarthy) to take down a Russian mobster.

Revisiting her cop attire from the 2000 film Miss Congeniality (before the sexy makeover), Bullock, 47, stepped onto the set wearing a frumpy blue blouse, baggy gray dress pants and plain black shoes.

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Bullock's last project, a thriller costarring George Clooney titled Gravity, was set for release on Nov. 21, 2012, but according to The Hollywood Reporter it has been pushed back to a 2013 release.

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When she's not busy working, the single mom is spending time with son Louis, 2, whom she adopted in early 2010. "I'm sure Louis has influenced me in ways I don't even know how," Bullock told E! News. "Everything becomes richer or more important or more frightening or more challenging."

This article originally appeared on PIC: See Sandra Bullock's Short Wig, Frumpy Cop Look