Prince William and Kate Middleton returned to Westminster Abbey nearly 10 years after their royal wedding in 2011. On Tuesday, The Duke and Duchess of Cambridge visited with the staff of the vaccination site that’s been set up at the historic church. Kate wore a cream dress coat with intricate detailing that seemingly celebrated the wedding anniversary with its bridal vibes. The royals are preparing for a more somber milestone on July 1, which would have been Princess Diana’s 60th birthday. Royal expert Katie Nicholl told ET that ‘the real test’ of William’s relationship with Prince Harry will be if his brother returns to the UK to attend a statue unveiling to commemorate their late mother on that day.