A new documentary is taking a behind-the-scenes look at Prince William and Kate Middleton s wedding, just in time for the royal couples 10th anniversary.

The Day Will and Kate Got Married , which was released Wednesday, unpacks the events leading up to the April 29, 2011, nuptials with commentary from royal experts. Among the films most buzzed -about segments is an interview with baker Fiona Cairns , who created the couples eight-tiered, 3-foot-tall wedding cake.

Cairns, who is based in Leicestershire, England, said assembling, transporting and then reassembling the cake was no easy task. She and her team even had to remove a door that led to the Picture Gallery in Buckingham Palace, where the cake was to be situated.