Article continues below advertisementOK! can reveal Meghan Markle's 41st birthday tribute to Prince Harry has sparked fresh criticism, with social media users mocking everything from the image choice to how it is linked to one of the royal's most high-profile exes.On September 15, Meghan, 44, took to Instagram to celebrate her husband's milestone with a throwback photo of the ginger-haired ex-soldier from a RAF flypast at Britain's Goodwood Aerodrome in West Sussex.Article continues below advertisementSource: MEGASocial media users slammed Meghan Markle's birthday post for Prince Harry.