Leslie Jean Mann (born March 26, 1972) is an American actress. She has appeared in numerous films, including The Cable Guy (1996), George of the Jungle (1997), Big Daddy (1999), Knocked Up (2007), 17 Again (2009), Funny People (2009), This Is 40 (2012), Mr. Peabody & Sherman (2014), Blockers (2018), and Croods: A New Age (2020).

Early life
Mann was born in San Francisco, California, and grew up in Newport Beach. She was raised by her mother, Janet, who led design and quality programs for eight years at Ayres Hotel group. Mann has stated of her father, "My dad is...I don't really have one. I mean, he does exist, but I have zero relationship with him." She has two siblings and three older step-brothers. Her maternal grandmother, Sadie Viola Heljä Räsänen, was the daughter of Finnish immigrants.

Mann has said that she was "very shy, kind of pent-up" during her youth. She graduated from Corona del Mar High School, and studied acting at the Joanne Baron / D.W. Brown Acting Studio and alongside comedy improv troupe The Groundlings. She attended college and studied communications, but dropped out before graduating.