Julianna Margulies Surprises Cate Blanchett Mid-Interview at 'Tár' Premiere (Exclusive)

Julianna Margulies crashes Cate Blanchett's interview with ET at the premiere of 'Tár,' which is in select theaters on Oct. 7 and nationwide on Oct. 28. Watch Cate's priceless reaction to Julianna's surprise. Plus, the 'Tár' actress opens up about working on the film and reveals what she took away most from her experience during filming.