Rashida Jones confirmed via Twitter that she’ll speak at Harvard’s Class Day on May 25. “I am so honored to be Harvard’s 2016 Class Day speaker!!,’’ she tweeted. “Can’t wait to come back. Am I too old for a kegger?’’ Actress-writer-producer Jones (inset), best known for “The Office,’’ “Parks and Recreation,’’ and the Steve and Nancy Carell-produced comedy “Angie Tribeca,’’ graduated from Harvard in 1997. Last year’s Class Day speaker was 2003 grad Natalie Portman. In 1997, when Jones graduated, the Class Day speaker was her dad, Quincy.