Kristen Wiig bid a somewhat surprising farewell to “Saturday Night Live” after seven years at the show. NBC made no prior announcement that Saturday's season finale would be Wiig's last as a cast member. But with her movie career taking off – she co-wrote and starred in “Bridesmaids” – it had been rumored she would leave. In the show's final sketch, guest host Mick Jagger played the principal at a high school graduation and brought up Wiig, in cap and gown, saying she was “one particular student who is leaving this summer.” Wiig danced with Jagger, executive producer Lorne Michaels and cast members to the Rolling Stones tune “She's a Rainbow” and appeared to hold back tears. Wiig's range of characters on “SNL” has included neurotic attention-seeker Penelope; Kat, half of the musical duo Garth and Kat; and such real-life notables as Björk, Kathie Lee Gifford (she's always smashed) and former Speaker of the House Nancy Pelosi. (The Associated Press contributed to this report.)