Duke and Duchess of Cambridge immortalised in wax at Madame Tussauds Madame Tussauds is expecting the Cambridges to be the most popular wax figures and they may even surpass interest in the Queen. Liz Edwards, from Madame Tussauds, said: "The Queen is the most popular attraction but since the royal wedding fever we've had people coming in to see William when he was without Catherine. Catherine has her own star quality so we are expecting a lot of people to come, especially with the Easter weekend coming. Sculptor Stephen Mansfield created William's wax head and has worked on high profile figures like David Cameron, the Duchess of Cornwall and David Beckham, but said the interest in the new royal figures was likely to surpass these celebrities. The artist said: "Visitors have been demanding this for ages, we do marketing work and the duke and duchess were right at the top of what people wanted to see." Madame Tussauds said they approached St James's Palace to have a sitting with the royal couple for their wax works, which cost £150,000 each, but due to their busy schedules a time could not be arranged so pictures were used to create the models. In the past royals have sat for sculptors from the famous London attraction including the Queen, Diana, Camilla, the Duke of York and his former wife Sarah. Louis Wiltshire, who made Kate's wax head, said: "We created the engagement scene, that press call when they both looked a little bit nervous but so happy - that's what we wanted to come across. We started by using as many pictures as we could get hold of from all sorts of different occasions and we pieced the head together from different photos to get the structure right - likeness is important but so is the expression. It takes about five weeks to sculpt the head in clay and the body takes about the same time. Kate's Issa dress was specially made by the fashion label for Madame Tussauds in the duchess' measurements while William is dressed in a replica of the Gieves and Hawkes suit he wore at the time. The couple's heights were given to the artists and they used the measurements from their clothes and their sizes compared to other royals to get the proportions right. A team of around 30 worked for four months creating each of the models from sculpting and colouring the heads, to painting the eyes, creating the head of hair a strand at a time and styling clothes and accessories. The process of making the head involved spending many hours modelling the features in clay, then a plaster mould was made of the artwork and finally wax was poured in to create a hollow head of the subject. Accessories include a replica of the sapphire and diamond engagement ring which once belonged to Diana, Princess of Wales, and the duke's Omega Seamaster watch. Madame Tussauds have said William and Kate have an open invitation to come and see themselves in wax.