Blissfully unaware of her dad taking a photo, Harper was pictured going about her normal routine before bed. The little cutie stood on her tiptoes as she brushed her teeth, leaning over a sink.
David, 40, felt so much pride for his adorable daughter that he had to share the snap with his 20.3 million Instagram followers.
"Does that get any cuter?" wrote David Beckham
"Teeth time a few hours ago and I walked in to the tippy toes and the United stripe plus a perfect plait," wrote David. "Does that get any cuter?"
The former Manchester United star and his wife Victoria named their daughter Harper Seven after David's lucky number, which he also wore on his football shirt.
David has the roman numbers VII tattooed on his right arm, as well as the words "Harper" and "Pretty lady" tattooed across his neck.
"I have no power with that little girl – no power whatsoever," said the football star
The Beckhams are also proud parents to sons Brooklyn, 16, Romeo, 13, and 11-year-old Cruz. But it's his youngest child and only daughter Harper who knows exactly how to get her way with him.
"I have no power with that little girl – no power whatsoever," David recently told Entertainment Tonight. "I love all my children, of course, equally, but I'm definitely stricter with the boys than I am Harper, which gets me in trouble with my wife of course."
David admitted that he'll have strict dating rules for his only daughter
When it comes to dating, the athlete admitted that he and his wife Victoria have rules set in place for their children. Their eldest son Brooklyn is rumoured to be dating French beauty Sonia Ben Ammar.
"Obviously Brooklyn is definitely at that age. You know, he's 16, he's definitely at that age," said David. "We're strong parents, and strict parents, but we're like most parents. We love our kids and we want the best for them, so we'll see."
When it comes to Harper, he admitted that the rules won't be the same. "Oh yeah, that'll definitely be different," laughed the protective dad.