The Blended actress, 39, looked skinny as she ventured out in loose-fitted jeans, and a blue-and-gray striped button-up. She wore black sunglasses and gave the ensemble a touch of color with a bold red lip.
Barrymore and husband Wil Kopelman's daughter Olive, 20 months, became a big sister when they welcomed Frankie last month. Two days later, best friend Cameron Diaz joked that she helped Barrymore get her "game face" on before her delivery.
"We had a baby girl!" Diaz, 41, gushed during an appearance on The Tonight Show With Jimmy Fallon on April 23. "I feel like I know her already."
Barrymore has yet to reveal a photo of her baby girl, but did open up about her latest addition while promoting her new comedy Blended. "It's great, couldn't be better," she told Us Weekly this month. "I couldn't fake it, I'm really happy, and everything is just as good as it could possibly be."