Kate works her high street magic in a Topshop dress at Warner Bros Studios

Kate works her high street magic in a Topshop dress at Warner Bros Studios
Kate Middleton championed British high street fashion when she wore a £38 cream and black polka dot dress from Topshop for her tour of the Warner Bros. studios with husband Prince William and brother-in-law Prince Harry on Friday.

The trio are touring the studios where the Harry Potter films were shot as they attend the inauguration of the Hertfordshire venue. 

The fashionista duchess”s affordable dress comes at the end of a week of engagements which have seen her wearing outfits from high end designers including a bespoke baby blue Emilia Wickstead cocktail dress. 

For her studio tour however, the mum-to-be teamed her affordable dress with a fitted black Ralph Lauren jacket, her trademark black suede heels and a matching clutch bag.

The lucky royals will receive a wand lesson in The Gryffindor Common Room and a special effects demonstration on the set of the wizards” shopping hub, Diagon Alley.

The Duke and Duchess of Cambridge and Harry will meet creative teams from recent productions at the sprawling site which boasts The Making of Harry Potter attraction.

They will also have the chance to delve into the hoardes of props and costumes that were used during the blockbuster movie series.

William is due to make a short speech. The three young royals will later host a meeting for their Charities Forum in the Great Hall, one of the most famous sets from the Harry Potter films.

The forum, which was founded by the brothers in 2006, enables them to bring their individual charitable interests together and find out how they can support them all in the most effective ways.

Chief executives from more than 35 charities associated with the three royals will be present at the event near Watford. Around 500 guests from their various charities, including children and their parents, are also expected to attend.

Film giants Warner Bros. invested around £100 million into the facility after taking over the site in 2010. All eight Harry Potter films were shot there over a ten year period.

The vast studios were also the home of James Bond film Goldeneye and Sleepy Hollow.

It isn”t the first time that the royals have delved into wizardry. Prince Charles and Camilla visited London”s King”s Cross train station in January to see platform 9 3/4 where budding wizards take their trains to Hogwarts.

Friday”s tour marks Kate”s third engagement of the week, following visits to a Manchester primary school on 23 April and a return to the National Portrait Gallery on 24 April. She will also visit Naomi House children”s hospice on 29 April.