The former soccer star took to Instagram on Sunday to share a heartwarming video of his 5-year-old daughter, Harper, peddling away in a park on her tiny pink bike, without the help of training wheels.
"First time riding on your own, Harper!" David exclaimed as he ran alongside her.
David wrote that he was "so so proud" of his little girl in the caption to the short clip, along with a heart emoji.
David and wife Victoria Beckham welcomed Harper in July 2011, and share three other children -- sons Cruz, 12, Romeo, 14, and Brooklyn, 18.
On Saturday, David paid tribute to his wife of 17 years in celebration of Mother's Day in the U.K. with a black and white photo of his wife and their children looking out over the ocean.
"Happy mama's day to another amazing mummy," David captioned the sweet snapshot. "Someone that has raised these beautiful little ones to be the most precious, special and loved children ... A woman that has drive, passion, intelligence and love for her children. What gets any better than that?? Thank you for giving me the most beautiful gift."
He also shared some heartfelt sentiments for his own mom, Sandra, with a photo collage of throwback mother-son pics, all the way back from when he was a little boy learning how to swim to now, as a superstar celeb and father of four.
"You deserve a day of love and looking after every single day but today is your day so don't resist the love that will be coming your way because normally you make it about everyone else except you," he wrote. "Thank you for being that person that has always been here for me no matter what... Happy Mother's Day mum."
Earlier this month, Beckham's eldest son, Brooklyn, celebrated his 18th birthday, and his proud parents shared some super sweet snapshots of their son to Instagram to commemorate the milestone. Check out the video below to see more.