February 21, 2014 - 12:18 GMT hellomagazine.com Rumours have been sparked that Kate Middleton is contemplating cutting her hair. Kate Middleton's gorgeous waves and enviable blow dry mean that she has some of the most sough-after tresses in the country.Scroll down to see odds on which hairstyle Kate will choose However, The Duchess of Cambridge's first official royal engagement of the year has sparked speculation that the elegant royal is contemplating changing her hairstyle, after it was noted that her hair had grown past her shoulders. The elegant royal looked stunning in a midnight blue Jenny Packham gown and a diamond necklace borrowed from the Queen, as she attended the National Portrait Gallery's Portrait Gala as the guest of honour. Further reports arose that the Duchess of Cornwall advised Kate to trim her chestnut brown locks after her following visit to the Art Room project at Northolt High School.Wearing a stunning blue L.K Bennett dress, the Duchess was caught in a gust of wind and laughed good-naturedly as it blew her hair over her face. There has been widespread speculation about what hairstyle the Duchess would choose, with bookies' favourites being a shorter, shoulder-length hairdo, whilst the most extreme suggestions include the Duchess echoing Jessie J's dramatic makeover and shaving her head. • 1-4 odds on a shorter, shoulder-length style • 3-1 odds on a classic bob • 8-1 odds on a pixie crop • 10-1 odds on transforming her luscious brown locks to shiny blonde tresses • 20-1 odds on hair extensions • 100-1 odds on a perm • 1000-1 odds on dreadlocks • 1000-1 odds on radical cornrows • 1000-1 odds on a full-on Afro • 5000-1 odds on shaving everything off Odds provided by Coral. The Duchess assisted the Queen in hosting a star-studded reception at Buckingham Palace on Tuesday, in honour of RADA, of which the Queen is a patron. The stunning royal wore a red Alexander McQueen dress to meet stars such as Ralph Fiennes, Helena Bonham Carter, Alan Rickman and Sir Roger Moore. Kate also spoke with Dame Helen Mirren, who was presented with a fellowship at the BAFTAs on Sunday night by Prince William. "My husband called you granny last night," Kate jokingly told the actress. "How delightful she was," recalled Helen. "Very sweet."