Jennifer Garner stepped out on Tuesday in her first red carpet appearance since her split from Ben Affleck — and she looked amazing.

Jennifer Garner

Mike Windle/WireImage

The 43-year-old actress stunned in a black, knee-length dress as she attended the Chanel dinner in honor of Baby2Baby at Chanel Boutique in Los Angeles, California. Garner kept it simple with black, ankle-strapped heels and a matching clutch purse. She let her brown locks tumble over her shoulders.

The actress was among a slew of celebs at the dinner, like Jenna Dewan-Tatum, Ellen Pompeo and Selma Blair (all of them opted for blazers and pants or shorts at the dinner).

Garner posed for pictures and, in one, is seen sporting a serious expression with her hand on her hip.

Earlier this week, she and Affleck, who announced their divorce in June, were spotted out having a friendly dinner on Sept. 20 in Malibu, California.

The two have been spending quality time together with their three children Violet, 9, Seraphina, 6, and 3-year-old Samuel since returning to Los Angeles after their summer in Atlanta, Georgia.

“They are working together and are keeping it amicable,” a source close to the couple previously told PEOPLE. “This is something they have been working on for over a year – and they continue to be strong unit.”

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–Char Adams, @CiCiAdams_