Stacy and Margaret switch back so that Stacy can bake at the competition. They both admit they've fallen in love with the men in each others' lives.
As all this has been going on, Prince Edward's father has ordered his assistant, Frank (Mark Fleischmann), to investigate Margaret because she's been "acting different" lately. After many, many hilarious failure, he nabs a photo of Stacy and Margaret in the same room together, and shows the proof to Edward's kindhearted mother, Queen Caroline. Will she ruin everything?!
The baking competition arrives! It's just as hokey as you'd expect, but with a twist — Brianna (remember her?!) decides to sneak into the room the night before to snip the cord to Stacy's mixer.
Oh, sorry, that's not the twist! The twist is that Stacy and Kevin are able to bake a six-layer cake masterpiece without their mixer, somehow. Stacy doesn't even realise that she's been f*cked with until she needs to "puree the berries." There are no berries on their finished cake though?! WHAT IS HAPPENING IN BELGRAVIA?!
The judges come by the table and give a detailed critique of Stacey and Kevin's cake, even though they clearly put their slices back on the table without having taken a single bite. Not even a nibble.
But who cares, because they win the competition!
Kevin never once realises that Stacy wasn't herself all that time.
It's not until Prince Edward rolls up to present the trophy with Margaret — dun, dun, dunnnn! — that it's all revealed. Kevin appropriately freaks out for, oh, I don't know, three seconds? And then decides it's totally cool that his BFF/love interest has a secret twin, and he doesn't need to ask any questions.
Prince Edward must feel the same, because he proposes to Stacy!