From the moment Meghan Markle married Prince Harry, there's been a mountain of speculation over the former actress' relationship with Kate Middleton.
At first, it was widely rumored that there was an intense rivalry between Meghan and Kate.
Some outlets are still beating that drum.
In fact, just this week, The Daily Mail ran a piece claiming that Meghan and Kate simply don't get along.
But for the most part, the narrative that's emerged from Meghan's first six months as a resident of Kensington Palace is that she and Kate have managed to patch up their initial differences to form a tight bond.
And it makes sense, as there's really no one else on the planet who can relate to Kate and Meghan's situation -- including Kate's sister, Pippa.
Sure, Pippa also got married recently, but she didn't marry into royalty, which means she can't fully identify with Kate the way Meghan can.
And it seems she's not thrilled with the fact that Kate and Meghan have recently become BFFs.
“Pippa is incredibly jealous over Kate and Meghan’s relationship," a source close to the situation tells Radar Online.
The insider notes that the duchesses have become especially close in the months since Meghan became pregnant.
“Meghan is turning to Kate for everything related to her pregnancy right now and Kate loves it because she is a very hands-on mother," the source claims.
"She knows that Meghan wants to be too.”
According to the insider, all is love and togetherness in the palace these days -- and Pippa is stuck on the outside, grumbling like the Grinch looking down on Whoville.
“Because Kate and Meghan are bonding, this has made Will and Harry closer than ever," says the informant.
“Kate was very lonely in the palace before Meghan came along. Meghan is bringing life into her and making Kate not so stiff and, for that, everyone is pleased.”
Of course, the insider confirms that this is a rather new development:
“At first the two were not in cahoots because Kate felt like Meghan was only in it for fame and status. But she has changed her mind about her,” the source claims.
Yes, it seems Kate initially felt protective of Harry, but she warmed toward Meghan upon realizing that the former actress wasn't just looking to climb the social ladder.
“Kate and Will both agree that Meghan is absolutely in love with Harry. And for that Kate will help her however she can," says the source.
Sounds like an ideal situation for all involved -- but it's not hard to see how Pippa might be left feeling the odd woman out.