In the video, Radcliffe explains to Sudeikis that the "Potter" flicks were not sex films, convinces the "SNL" star is British accent is natural and then does his version of an American accent:
"Chill broseph, I like Mountain Dew and big butts!"' he tells Sudeikis.
Radcliffe, whose post-"Potter" horror flick "The Woman in Black" opens on Feb. 3, is the first of a string of upcoming newbie "SNL" hosts. NBC announced Channing Tatum will host on Feb. 4 (with musical guest Bon Iver), while "New Girl" star Zooey Deschanel hosts on Feb. 11, with musical guest Karmin.
Check out Radcliffe -- whose musical guest is Lana Del Rey -- in action below: