Why Jon Hamm and Jennifer Westfeldt Split After 18 Years: 'She Was Tired of Being His Mother' | Entertainment Tonight arrow-left-mobilearrow leftarrow-right-mobilearrow rightGroup 7Gallery Icon Copy 2Video Play Button Copy 5Hamburger MenuInstagramTwitterYoutubeShare Button7C858890-6955-48EA-B871-66CE1E33590CVideo-Playbutton Copy Skip to main contentncG1vNJzZmivp6x7psDOp6OippVjsLC5jqecsKtfZoRygJVplrCgqZS3sLq%2BoZimpY%2BWu6WryZ6lp6GWmr%2Bgw8Ssq5%2BdnJnBoL%2FPpaCtl5Gbwaa%2BvmpvmLGVlr%2B0