Renée Zellweger Reacts to Her Unrecognizable Transformation for 'The Thing About Pam' (Exclusive)

Renée Zellweger chats with ET's Lauren Zima at the premiere for 'The Thing About Pam,' premiering March 8 on NBC. The actress is unrecognizable as Pam Hupp, the real-life woman at the center of the anticipated true-crime series. Renée, who's no stranger to on-screen transformations, talks about why she chose to wear a prosthetic for the series instead of doing a physical change like she did in 'Bridget Jones’ Diary.' The 'Judy' star also reacts to her 2002 film, 'Chicago,' celebrating its 20th anniversary later this year.