Stacy prepares with her boyfriend and colleague, Kevin, for a Christmas cake competition that will come in over a week. While at Belgravia to participate in this contest, Stacy is shocked to meet the Duchess Margaret who physically resembles her. The two are puzzled at first, but then they get together and agree to share roles for a few days. But this plays and the exiting of the daily turns into something more when Margaret falls in love with Kevin, and Stacy with the Prince of Belgravia.