The 36-year-old Oscar winner and mother of three will receive the organisation's
Grace Kelly Award at its Celebration of Babies event in
Beverly Hills tomorrow. The award recognises celebrity parents committed to healthy pregnancies and families.
Witherspoon gave birth in September to a son,
Tennessee, with her husband, talent agent
Jim Toth. She's also mother to Ava, 13, and Deacon, 8, from her previous marriage to actor