The Duchess of Cambridge (and bump!) will meet with cast during an official visit to Ealing Studios in London on Thursday, 12 March.
Kate, 33, is thought to be a big fan of the period drama so no doubt this is one public engagement she's particularly looking forward to!
The pregnant royal will meet with cast including Dame Maggie Smith, Hugh Bonneville and Elizabeth McGovern and watch a scene from the ITV hit being filmed in the servants' quarters.
It's thought she'll spend around 90 minutes on set.
The Palace said Kate's visit was to " celebrate the success of the award-winning production" which has enthralled millions around the world.
It will be one of three engagements Kate carries out next week.
On Wednesday, 11 March she will tour the National Portrait Gallery's Turner Contemporary, Margate in her capacity as patron, and visit the Resort Studios in Cliftonville, Margate.
Kate and husband Prince William will welcome their second child in March. First son, Prince George, will be two this summer.
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