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Prince Harry and Meghan Markle are set to appear in one of the most explosive and highly-anticipated interviews in royal history this weekend - and it looks as though the pressure of their no-holds-barred sit-down with Oprah Winfrey may well be causing some tension. 

The couple were seen looking very somber while driving around Santa Barbara with the Duchess' mother Doria on Sunday afternoon - hours before two teaser clips from their no-holds-barred primetime interview were shared, sending tremors through the palace by laying bare just a few of the sensitive, and potentially-uncomfortable topics discussed by the Sussexes.