"Doria's quiet dignity and grace at the Royal wedding has earned her enormous respect from Meghan's new in-laws", the source tells ET.
The "very thoughtful gesture" of inviting Doria to spend Christmas with the royals at their Norfolk castle is also a pretty unprecedented one: while Kate Middleton's parents, Michael and Carole Middleton, have joined the royal family for Christmas church service, they've never stayed at Sandringham, as Doria likely will.
A source close to the family says that the invitation is a "mark of [the Queen's] respect" for Meghan, an acknowledgement that she doesn't have any family in England.
A spokesperson for Buckingham Palace declined to comment today.
Russian fighter buzzes USA recon flight over Black Sea
Near the city of Sevastopol, seat of the Russian fleet of the Black Sea, the aircraft approached 35 kilometers to the coast. He says there was no communication between the two aircraft and the incident lasted about 25 minutes.
Breaking Bad movie is officially in the works
AMC's hit TV drama Breaking Bad might have ended back in 2013, but the wider universe it was set in continues to thrive. It's also not yet known if Breaking Bad stars Bryan Cranston or Aaron Paul will participate in any way.
Mr Markle pulled out because of health problems just days before she was due to walk down the aisle and admitted he had staged paparazzi pictures.
He later said he had apologised to both Harry and Meghan and denied staging the shots for money, insisting they were taken in a bid to "change his image". She even flew in from Los Angeles to celebrate the release of Markle's charity cookbook, titled Together: Our Community Cookbook, and fans have been speculating we'll be seeing even more of the grandma-to-be as the expectant duchess prepares to welcome her first baby.
Doria introduced herself to guests on the day as "Meg's mom".
Meghan and Harry recently returned to the United Kingdom from their mammoth Commonwealth tour and will be spending their first Christmas together as husband and wife in December.
A Day in the Life of a Red Dead Redemption 2 NPC
Red Dead Redemption II players have been venting their anger by sending a real person named Colm O' Driscoll hate messages online. Fans of the popular console game Red Dead Redemption 2 can explore a hidden Mexico map by exploiting a glitch in the game.
Spotted: Steekers' Le'Veon Bell seen at Pittsburgh gym
If you want the latest on Le'Veon Bell, just jump on his Twitter page - and stand on your head. & that's clearly on them. If Bell doesn't report to the Steelers by that date, he won't be allowed to play at all this season.
Pres. Trump says government will halt if Dems investigate him
Trump said he is "looking at different people for different positions", adding that "it is very common after the midterms". At his news conference, Trump said "there was nothing sarcastic" about his praise, saying she had "fought long and hard".