Before the bash got underway, whatsoever, the Arthur actress indulged herself with a spa treatment that a.m. at the Peninsula Hotel.
"There were lots of kids scampering approximately and laughter listened all the direction from the avenue," a source tells Us Weekly.
PHOTOS: Adorable pics of Violet and Seraphina
By early afternoon, almost 30 visitors, most of them with kids of their own -- including Affleck's BFF Matt Damon -- had arrived by the family's home bearing gift boxes from Barney's, Neiman Marcus and elsewhere.
Even with busy movie timetables and two daughters underfoot, Garner has said namely she and Affleck (they marital in 2005) still find time as legend.
Jennifer Garner celebrated her 39th birthday on Sunday with a low-key, outdoor grill at the Pacific Palisades, Calif. pad she shares with hubby Ben Affleck and their two girls Violet, 5, and Seraphina, 2,
PHOTOS: Jen Garner's life for a supermom!
"You pilfer the time. You embezzle a date, you steal a kiss, you steal a murmur. You sit afterward to each other above the couch with computers ashore your laps. After the kids are asleep you...well, you know," the actress told Parade last year.
One year to go ahead 40!
The kid-friendly, catered list punctuated Southern solace food staples: grilled corn, mac 'n cheese and barbecue shrimp. See extra photos from Jen's birthday bash.
PHOTOS: See what Jen looked favor as a kid
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