A fixture of “early prime” television is saying farewell. After 29 seasons of hosting Entertainment Tonight, the top-rated syndicated magazine show, Mary Hart has decided to call it quits after next season, her 30th. "I've had the privilege of spending 29 years doing something I love—how often does that happen?" she said. "I've reached a point when I clearly realize it's time for a change. There are many things I want to do in my life and I'd better get on with them," she said. No official successor has been named, though speculation is on The Insider host Lara Spencer.