Kyle Richards is reportedly estranged from her newly-pregnant niece, Nicky Hilton.

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Following news of Hilton's pregnancy, which comes just months after she wed James Rothschild in London, England, a source claims The Real Housewives of Beverly Hills star has been shut out of Nicky's life.

"Nicky isn't taking Kyle's calls, or returning text messages. All communication is cut off," a source told Radar Online on Thursday.

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According to the source, Nicky was "angered that her society wedding was included as a storyline on the Real Housewives of Beverly Hills. The wedding was everything Nicky wanted it to be, but feels it has been tainted by Kyle letting the entire world know about all of the drama that went on behind the scenes."

As fans saw on the Bravo reality series, Richards was advised against attending Nicky's wedding, but was ultimately invited just prior to the ceremony. Meanwhile, Richards' husband, Mauricio, and two of their oldest daughters were left off the guest list, and Nicky doesn't regret her decision at all--especially considering she feels that Mauricio betrayed their family by leaving her dad's real estate firm to start his own.

"Nicky won't waste her time worrying about Kyle. She is happy and so excited about the pregnancy," the source said. "Nicky didn't feel bad for not inviting Mauricio to the wedding. She feels like Mauricio betrayed her dad, period. Nicky is extremely loyal to her parents, sister, and brothers."