- Has two daughters, Maude Apatow (born 1998) and Iris Apatow (born 2002), with husband Judd Apatow.
- Met her husband on the set of The Cable Guy (1996), a movie he produced.
- Leslie’s The Cable Guy (1996) co-star Jim Carrey described her looks as bearing resemblance to Marlene Dietrich.
- Leslie’s given name is Heather Alexandra Mann.
- She stands at 5’6″ tall.
- She graduated from Corona del Mar High School.
- Is a frequent collaborator with husband Judd Apatow. Some of their projects include, Knocked Up (2007), Big Daddy (1999), Funny People (2009), The 40 Year-Old Virgin (2005) and The Cable Guy (1996)
- Adam Sandler asked Leslie on a date before she met her future husband, Judd Apatow.
- Leslie and Judd’s daughter came up with the idea of having the drunken Nicky (played by Leslie Mann) fall asleep while driving Andy to her place and bouncing off of parked cars.