Jen Garner Had A B-Day Party And Everybody Came!

No wonder Ben Affleck is back in town!

Superstar mom Jennifer Garner turned 38 yesterday and had a big birthday bash in the Pacific Palisades to celebrate - tons of celeb friends showed up, including Reese Witherspoon and her new beau, Tobey Maguire and co., Molly Sims, Jason Bateman, Jimmy Kimmel and Don Cheadle.

Nothing like a party with your gorgeous Hollywood pals to make you feel young (at heart)!