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The Kardashian-Jenner Sisters Refuse To Speak About Rob's Engagement

This is kind of sad.

The Kardashian-Jenner clan has refused to speak of Rob Kardashian and Blac Chyna’s engagement on social media.

Sisters Kim, Khloe, Kourtney, Kylie, and Kendall—all active users of apps Twitter, Snapchat, and Instagram—have maintained a social media blackout amid news their once estranged brother is officially engaged to the model.

His family has flown to Vail, Colorado for a well-timed snow-sports break, which is being filmed for the show Keeping Up With The Kardashians, and they are not speaking to the media. However, a source says Rob has been in contact with family matriarch Kris Jenner since the proposal.

"No one (in his family) is jumping up and down with excitement today," a source tells People.com. "They have made a united decision as a family to not comment on social media yet about Rob's engagement. The news is not shocking, and not totally unexpected," the source added.

Rob, 29, and Blac, 27, who is the ex-partner of Rob's sister Kylie's boyfriend Tyga, celebrated their engagement at a strip club in Las Vegas.

The couple looked happy as she showed off her gorgeous seven carat custom made round brilliant cut diamond in an eternity band setting, made by Rob's longtime friend, jeweler Ben Baller.

Rob covered a room in Blac's house with hundreds of rose petals when he proposed. He also adorned the place with candles before dropping on bended knee in front of Blac and her mother, reports TMZ.

However, sources close to the family fear that Rob is being manipulated by his girlfriend.

"There has been a fear that Blac Chyna is manipulating the situation with Rob. That he is getting himself into a situation that is not ideal for him. Let's just be honest, no one is really hoping for a marriage to happen," added the source.

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If the two do marry, Blac, who plans to go by her real name, Angela, will take Rob's name.

"She's soon to be Angela Kardashian. She's ecstatic," the rep told People.com on Tuesday.

Blac Chyna and Rob are rumored to be considering filming a reality show focusing on their engagement and wedding planning.