Meghan Markle turned 40 years old on Aug. 4, and she was showered with love on social media. Even Kate Middleton and Prince William popped onto Twitter to send Meghan a message. The Duke and Duchess of Cambridge posted a stunning photo of Meghan on the social media site, along with the caption, “Wishing a Happy 40th Birthday to the Duchess of Sussex!” They also included a birthday cake emoji to complete the tribute.