EXCLUSIVE: British actress Janet Montgomery (Black Swan, Our Idiot Brother) has landed the lead in CBS’ drama pilot Baby Big Shot. The project, from writer Dana Calvo, showrunner Kevin Falls, Sony TV and Jamie Tarses’ Fanfare, is a legal drama centered on Martina (Montgomery), a working-class woman who uses her street smarts to compete with her more polished colleagues at a top New York law firm. Baby Big Shot is a rare drama pilot with a 20something female lead this season that sparked competition among young actresses. Montgomery, repped by UTA, Anonymous and UK’s Hamilton/Hoddell, played E’s assistant Jennie in HBO’s Entourage for the last few seasons and also was a regular on Season 2 of Fox’s Human Target. She is now filming the BBC miniseries Dancing On The Edge.