David Beckham Says He's Stricter With His Sons Than Harper: I Have No Power With Her

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While he doesn't play favorites, let's just say David Beckham gives fewer restrictions to his only daughter, four-year-old Harper.

"I have no power with that little girl - no power whatsoever," Beckham told ET, while promoting his H&M Modern Essentials campaign at Gemma restaurant in New York City. "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."

WATCH: David Beckham Says Wife Victoria 'Had Quite the Party' After 'Spilt Drink'

In addition to Harper, David and Victoria Beckham have three boys: Brooklyn, 16, Romeo, 13, and Cruz, 10. Despite their busy schedules, David and Victoria –- who have been married for more than 16 years -- have made it work in Hollywood. The former soccer player told ET the couple’s secret, saying that "nothing comes in the way of our family."

That rule extends all the way to fashion choices, as David admitted that there have been fashion missteps for both he and his wife - most notably the matching black leather outfits they wore to a party hosted by Versace.

"I look back over the years and think, 'Why did I wear that?' or 'What was I thinking?'" David said.

WATCH: David Beckham Pays Tribute to His Wife With New Hand Tattoo

David's style definitely has evolved over the years, but nowadays there may be more attention paid to his underwear than his outerwear. The 40-year-old athlete-turned-model is a spokesman for Calvin Klein underwear and he dished to ET about his wife's thoughts on the brand.

"They're very comfortable. What can I say?" David said. "And they make men look great."

Watch the video for a peak at the H&M Modern Essentials mini movie released Monday, featuring David and Kevin Hart.