The Spice Girl, 37, took all four of her kids, including sons Brooklyn Joseph, 12, Romeo James, 9, and Cruz David, 6½, to a movie and for a walk around the center.
After slipping a disk in her back recently, Beckham took to Twitter to thank fans for their well-wishes.
“Thank u for your kind messages,” she wrote. “I’m feeling much better and enjoying every precious minute with baby Harper, I’m so in love. X VB.”