David Beckham says daughter Harper is making him go grey.

The soccer star and fashion designer wife - who also have three sons, Brooklyn, 12, Romeo, nine, and six-year-old Cruz, together - welcomed the little girl into the world in July and David admits the stress of raising four children is starting to take its toll.

He told the Wall Street Journal magazine: "I got my first grey a few years ago, and a couple more since we've had the little girl."

The 36-year-old athlete also admits he's starting to feel his age as he now has more aches and pains when he wakes up.

He said: "I definitely feel different than I did 10 years ago. It takes a while for the Achilles to warm up. Once I've had my coffee, I'm good."

As well as being a successful soccer player, David recently launched his own fragrance and has a signed a deal to design his own leisurewear and underwear but insists he is completely involved with everything.

He said: "I'm totally involved in everything that goes out there in stores. I don't just sign with a company and give my name to do whatever they want. Everything that goes out there is something I would wear."