Victoria Beckham gave fans a treat on Tuesday as she shared a shirtless snap of her husband David to Instagram while wishing him a happy 48th birthday.The fashion designer, also 48, showed off her other half by sharing a picture of the former footballer taking an outside dip and donning nothing but a pair of white Calvin Klein boxers. His tattooed side, torso and arms were on full display while the sportsman managed to keep cosy in a taupe beanie hat - despite lacking on the clothing front.Treating her 30.8million followers, Victoria captioned the post: "Let's all celebrate @davidbeckham !! You're welcome".