A royal snub? As In Touch previously reported, Prince Harry and Meghan Markle have agreed to celebrate Christmas with the queen and the rest of the royals at Sandringham this year. But now, a source says, Meghan, 40, is trying to get out of it because she doesn’t want to face Harry’s family. The duchess is even planning her own blowout holiday celebration at their $14.3 million Montecito, Calif., mansion. “They’re inviting all their A-list friends,” says the source. “Meghan made the gold-plated invites herself. Meanwhile, Harry has been stringing lights all over the house. They got a 10-foot tree and are about to buy a second one.” Expected to attend are Leonardo DiCaprio, Katy Perry, Orlando Bloom, Ellen DeGeneres and Abigail Spencer, among others. “Meghan would love if Mariah…