Popsugar Celebrity Royal Wedding 2018 Prince Harry and Meghan Markle Wedding Rehearsal The Gang's All Here! Harry, Meghan, William and Kate Arrive at Windsor Castle For Wedding Rehearsals 17 May 2018 by Terry Carter Image Source: Getty / Neil Mockford Prince Harry and Meghan Markle were spotted arriving at Windsor Castle on Thursday, just days before the couple is set to tie the knot at St George's Chapel on May 19. Prince William and Kate Middleton also arrived for what appeared to be a dress rehearsal for Harry and Meghan's big day. The photos came just hours after Meghan released a statement confirming that her father, Thomas Markle, would not be attending the wedding due to health concerns. Earlier in the week, Thomas told TMZ that he was undergoing heart surgery. Many are speculating that Meghan's mom, Doria Ragland, who was not spotted at the presumed rehearsal, will walk her daughter down the aisle in Thomas's place. Read on to see more photos of the soon-to-be in-laws at Windsor, then keep up with all our coverage of the royal wedding here. Related: Grab a Crumpet and a Cup of Tea — Here's Where to Watch the Royal Wedding! Image Source: Getty / Neil Mockford 1 / 2 Image Source: Getty / Neil Mockford 2 / 2 Royal Wedding 2018Meghan MarkleRoyal WeddingPrince WilliamPrince HarryKate Middleton