Prince William celebrated his birthday by attending Taylor Swift's concert in London with his two oldest children, Prince George and Princess Charlotte. The trio posed for a selfie with the singer, who also shared a photo with her boyfriend Travis Kelce. Princess Kate, who is undergoing cancer treatment, stayed home with Prince Louis. The royal family released a new photo of William and his children to mark his birthday, with a message from Kate. The singer was welcomed to London with a performance by the royal guard at Buckingham Palace. Kate made her first public appearance since her diagnosis at the Trooping the Colour parade. The future engagements for the Princess of Wales will depend on her health and medical team's advice.