The 39-year-old actress feted her pregnant friend with a backyard baby shower at her home in LA on August 4, reported Us magazine.
"Kids were jumping in a bouncy castle," a source says of the shindig, where 50 guests splashed around in the pool and noshed on chips and guacamole.
Barrymore's husband of two months, Will Kopelman, 35, also attended the event.
