Kelly Clarkson says she left 'The Voice' because she was 'struggling' to 'put on a smile' while filming the show, in an interview with ‘USA Today.’ The star reveals she found it difficult to be cheerful on the singing competition show while navigating her divorce with her ex-husband, Brandon Blackstock. She ultimately chose to move from Los Angeles to New York, where she says she's now in 'such a great place.'