Rachel Bilson Dresses Growing Baby Bump in Festive Frock, Denim Overalls: Picture

Pregnant Rachel Bilson dressed her growing baby bump in a festive red and blue frock in L.A. on July 31 Credit: Sam Sharma, PacificCoastNews

Rachel Bilson is killing it in the maternity style fashion department these days. The pregnant Hart of Dixie actress stepped out wearing a festive red and blue dress while shopping at Urban Outfitters in L.A. on Thursday, July 31.

Bilson accessorized the chic look with matching red sunglasses and neon yellow flip-flops. She carried a gray bag and kept her dark locks up in a ponytail.

Us Weekly broke news in May that Bilson, 32, and beau Hayden Christensen, 33, were expecting their first child together. "They've both talked about this for awhile and are so excited," an insider told Us at the time. "Everyone is beyond thrilled for them."

The parents-to-be returned home from a month-long Barbados babymoon on June 19, and Bilson promptly headed back to the set of Hart of Dixie. As previously reported, the CW series bumped up production and cut the upcoming fourth season down to 10 episodes due to her pregnancy.

Bilson was photographed earlier this week celebrating her costar Kaitlyn Black's 31st birthday during a table read. The makeup-free mom-to-be sat next to onscreen love interest Wilson Bethel and wore a white T-shirt with denim overalls. "Happy Birthday! Make a wish! #wish #birthdaygirl @kaitlyn_black29," costar Brandi Burkhardt wrote via Instagram.

Bilson has already had plenty of baby practice on set. "I think because I was the first one pregnant on the series she got to see a lot of what that was like," costar Jaime King told Us at the Annenberg Space for Photography Exhibit Opening in Century City, Calif., on May 22. (The model-turned-actress welcomed son James with husband Kyle Newman last October.)

"Her best friend has a kid and she has a lot of friends with children, so I'm just there to support her however I can and honor and respect her processes," King added of the O.C. alum. "She loves James, she's always bringing him toys. Just seeing her with my son, I know she's going to be the best mother."