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Kelly is joined by Kate Moss in a one-off spoof of the cult 80s TV show.
32-year-old Kelly played Krystle Carrington, originally played by Linda Evans, while fellow supermodel Kate Moss played on-screen nemesis Alexis, who was played by Joan Collins.
The show was a special birthday present to Topshop boss Sir Philip Green, and it cost a whopping £1 million.
'Philip is a hard man to please - after all, what do you get the man who has everything?,' an insider reportedly said.
'But he's a huge Dynasty fan,' continued the source, 'and his wife thought it would be great fun to have him and his family starring in a spoof episode.
'Kate and Kelly added some glamour as Alexis and Krystle and everyone loved it.'
Where can we watch it?!