Washington [US], June 23 (ANI): Taylor Swift added a touch of royalty to her Eras Tour show at London’s Wembley Stadium, where she was joined backstage by Prince William and his children, Prince George and Princess Charlotte. Following her performance on Friday, Swift took to her Instagram account and dropped a group selfie with her boyfriend Travis Kelce and the royal family, celebrating Prince William’s 42nd birthday. Along with the group selfie, Swift wrote a caption that read, “Happy Bday M8! London shows are off to a splendid start,” marking the special occasion. https://www.instagram.com…