Victoria said she and husband David have “so much to be grateful for” as she shared the loving photo.
“Proudest of days today watching Harper and Cruz being baptized in front of our friends and family,” she wrote.
“So much to be grateful for x With love, VB x I love u @davidbeckham x.”
Victoria uploaded another photo of Harper and Cruz, along with their other two children, Brooklyn, 20, and Romeo, 17, surrounded by their new Godparents.
Eva Longoria, Marc Anthony, hairdresser Ken Paves and sports agent David Gardner were seen in the picture beaming away to the camera.