The actress looked ready for spring as she walked the red carpet at the Florida premiere of Miracles from Heaven on Monday at the Regal South Beach movie theater.
Garner, 43, wore a white sleeveless Oscar de la Renta dress with a sweetheart neckline and a zipper down the front. She accessorized with pastel blue heels and finished the look with straight hair and a simple smoky eye.
In the film, which is based on a true story, Garner plays a mother whose faith is tested after her young daughter falls out of a tree and is somehow cured of her rare, incurable disease.
Garner has been traveling around the U.S. lately to promote the movie, her first release since splitting from her husband of 10 years, Ben Affleck, last summer.
Last week, she walked the Los Angeles premiere of the film with Bishop T.D. Jakes and opened up a bit about her faith.
"It has always been quietly a part of me," she told reporters. "I'm still getting used to the idea of talking about it."
She also opened up about her children, telling PEOPLE that "if someone tells me that they see something special – if they really get something special about my kids – that is the nicest thing they can say to me."