Canadian pop superstar Justin Bieber once suggested the young royal should probably be taking hair loss medication Propecia, and now Prince William has been on the receiving end of more stick; this time from his wife! The Duchess of Cambridge teased her husband, The Duke of Cambridge, about his thinning barnet during a trip to the Sydney Royal Easter Show. The royal couple were greeted there by the majority of an estimated crowd of 150,000 people on what was a gloriously sunny day in Sydney. Touted as an event that “brings the country to the city”, the two-week Sydney Royal Easter Show brings in an incredible 900,000 visitors each year, being a staple in the calendar of farmers, animal lovers, keen gardeners and the general public since its inception back in 1823. The 31-year-old Prince has mercilessly mocked his 32-year-old wife about her choice of clothes during the visit, choosing to inform Kate she resembled a banana in a yellow dress she was wearing and commented a dazzling green outfit she was sporting looked too bright. However, Kate soon managed to get her own back as the pair visited the impressive displays of produce, segregated by Australian regions. One exhibitor, Lyn Crejan, 67, was discussing the vast array of fruit and vegetables that were displayed in a colourful design behind her. The 67-year-old showed the royal couple a tuft of alpaca wool that happened to be a comparable shade of brown to that of William’s hair, Kate duly pounced. The Duchess, wearing a stunning white Zimmermann dress, joked that William should try using the alpaca wool as a wig. Ms Crejan, who works as a farmer in the settlement of Glenn Innes in New South Wales, said: "The Prince was interested in the alpaca and as I showed it to them the Princess said he should put it on his head. “She said, 'you need it more than me', and pointed to his head and he laughed.” It recent times at public events, it has been Prince Harry who has subjected Prince William to jibes about his hair loss, although the younger Prince has quietened his stance lately -  possibly after showing signs of hair loss himself. Harry was photographed in February 2013 whilst on a trip to Lesotho in southern Africa on behalf of his charity, Sentebale, with noticeably thinner hair and his scalp quite visible through his famous ginger locks. Hair loss is something that has been suffered by many male members of the Royal family, with William and Harry’s father, Prince Charles, also suffering hair loss for many years. In addition, the young royal’s grandfather, Prince Phillip and their uncle, Prince Edward, have lost much of their hair over the years.