Melissa McCarthy Will Do Anything for a Laugh
07/05/2013 AT 08:00 AM EDT
"A sweet midwestern mom," as costar Michael McDonald puts it. But then the cameras starting rolling – and McCarthy morphed into a "beast," says castmate Bill Burr.
The same woman who "doesn't even swear in real life," notes Heat director Paul Feig, "gets into character and suddenly the F-words start pouring out."
Wildly uninhibited, profanely funny and unafraid to use "everything in her toolbox," as Feig puts it, to get a laugh, McCarthy now finds herself in that most exclusive of showbiz stratospheres: an Oscar-nominated, Emmy-winning superstar with a hit sitcom (CBS's Mike & Molly) and a big-screen summer smash (The Heat, costarring Sandra Bullock, which raked in $40 million during its opening weekend).