The designer was sat chatting with Russell Brand and Gordon Ramsay as they watched the footballer play for LA Galaxy.
While everyone was transfixed on the match, Spice Girl Victoria found time to divert her eyes and sort out 15-month-old Harper's hair, which she tied up in a high ponytail.
Victoria even matched her outfit with her daughter's dress, wearing a white shirt with an orange collar.
They were also joined by brothers Brooklyn, 13, Romeo, 10, Cruz, 7, and Gordon's wife Tana.
David recently told HollywoodLife.com about the youngest member of their family.
He said: "She is a mixture of us both. She is walking and running around and the boys are running with her to make sure she doesn't fall.
"She is also kicking the ball around while she is carrying handbags."