Jimmy Fallon's long-rumored takeover of NBC's Late Night is now officially going to happen and will be announced in the coming weeks, according to anonymously-sourced reports from Fox News, Variety, Hollywood Reporter and Reuters. Current Late Night host Conan O'Brien is expected to take over from Jay Leno next year following a six-month break, and Leno is being pushed out. On Saturday Night Live, Fallon was famous for fumbling his lines by cracking up, and was recently named one of the two least funny comedians in the country. He'll take some jeers when he starts, but the critics were brutally hard on O'Brien in his early days, as well. And Fallon's already practiced being a tough, take-no-guff talk show host, as his well-liked Barry Gibb character on SNL, shown in the video after the jump (complete with another insult to the dignity of Times columnist Thomas Friedman).