After enduring a year of negative press and lawsuit threats, Meghan Markle decided to cap off 2019 with…more of the same. According to a U.K. report, Buckingham Palace ordered Meghan’s old pal Jennifer Meyer, 42, to cease and desist using images of the duchess, 38, wearing Jennifer’s jewelry on social media. “People are stunned” by the petty move, says an insider, adding that Jen — who is the daughter of a powerful Hollywood exec and ex-wife of Tobey Maguire — is tight with dozens of A-listers, including Jennifer Aniston, Reese Witherspoon and Gwyneth Paltrow. “Her brand is super successful, and her famous friends happily wear and promote her designs because they’re beautiful.” Those stars still appear on the designer’s Instagram page, but Meghan has been removed. “I’ve never heard of…