After 40 years in showbiz, Lisa Kudrow is making a "comeback." Her HBO series, "The Comeback," is the story of a faded sitcom star, Valerie Cherish, who signs on to a reality show about her attempts to stage a comeback.It's equal parts funny and cringey, and so is the show's back-story.Created by Emmy-winner Kudrow and former "Sex and the City" boss Michael Patrick King, "The Comeback" premiered in 2005. It was canceled after one season, but became a cult favorite, and so the show was revived for a second season in 2014.After that, it was shelved again. But now, a dozen years later, it's back for season three, starting on HBO tonight.To watch a trailer for "The Comeback" click on the video player below: The Comeback Season 3 | Official Trailer | HBO Max by HBO Max on YouTube We went to a taping at Warner Brothers in November, and it was clear that even after a decade away from Valerie Cherish, Kudrow hadn't missed a step.Asked how it feels to be back in Valerie's shoes, Kudrow described it as "unsettlingly…