The latest series of the BBC documentary show will consist of nine episodes, which are set to premiere at the beginning of June.
The 20th series, which will air on BBC One, promises an historical adventure across a spectrum of emotions: "Familial discoveries ranging from clog-wearing rope dancers and Scottish royalty to murder trials and tragic accidents [with] shocking truths, tears, and tragedies as well as moving and uplifting stories to viewers at home.
"The celebrities' journeys take them across the UK as well as to Ireland, the Netherlands, Canada, Jamaica and Australia in pursuit of the truth behind their family stories," continues the logline, with the family histories set to "impact them in ways they didn't think possible".
Simon Young, the Head of History at the BBC, said of the series: "As one of Britain's most beloved documentary series approaches 20 years on our screens, the line-up of household names, and the array of astonishing family histories, grow from strength to strength. This series is often imitated but never bettered, and this latest edition demonstrates why."
Executive producer Colette Flight echoed these sentiments, adding: "Who Do You Think You Are? is back with nine much-loved celebrities investigating their ancestry. The series will see them uncover incredible, moving and dramatic stories as their individual family trees reflect and shine a light on all of our shared history."
Who Do You Think You Are? series 20 will premiere on BBC One in June.
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