David Beckham has joked Victoria's butt might get big over Christmas.

The former soccer player is married to the designer, who is known for her extremely slim physique.

He has never had to give her the dreaded news that her behind looks large in an outfit, but quipped the festive season might take its toll.

"Luckily, it's not something I've ever had to say yet," he grinned to the British edition of OK! magazine.

"But you never know, after Christmas that might change..."

Victoria successfully made the transition from singer to designer and is now one of the biggest names in the fashion industry.

David, 38, gushed about how well his beautiful wife has done.

"Of course I'm proud of her," he smiled.

"I always am. I can't believe everything that she's achieved. She's a very talented woman. We have four beautiful children together too, who I couldn't be more proud of either."

David will always be remembered as one of the greatest soccer players and is currently promoting film The Class of 92 amid rumours he'll receive a knighthood.

While he's very happy with his career, it does put pressure on his children Brooklyn, Cruz, Romeo and Harper, particularly his sons.

"It's tough for the boys," he sighed. "Every time they step on to a pitch they have so many people looking at them. As far as I'm concerned, if they want to go into football then great. If they don't then it doesn't matter. All of my children will always have the support of their mum and dad."

David added that he tries not to think about receiving a Sir title and that first and foremost he's "just Dad".

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