The BBC announced that Kingston will play the younger sister of Atkins' character, Lady Holland, the racy-sounding archaeologist Blanche Mottershead.
"I simply couldn't resist the opportunity to get inside the iconic 165 Eaton Place," said Kingston, adding that Blanche is "a wonderfully, intriguing character ... who will over time reveal some secrets of her own."
It's certainly an interesting piece of casting, given that Kingston is almost 30 years younger than Atkins. She reportedly quit 'Upstairs Downstairs' because she didn't like the direction the scripts for the new season were taking.
Kingston's just one of several new cast members being lined up as the drama prepares to show a new, more raunchy side. Production on the new season, which is set in 1938 as Europe teeters on the brink of the abyss, is slated to being in October.
Producer Faith Penhale told 'The Daily Mail'that "We have a lot of other new arrivals and they are all very young and gorgeous. They bring with them their own set of stories. It is a series filled with passion, heartbreak and intrigue."
Whatever would Hudson and Mrs. Bridges think?