Her brother Rob shocked the world with the announcement of his engagement to Blac Chyna earlier this week.
But don't expect Khloe Kardashian to send a warm greeting to the happy couple.
The 31-year-old reality star is apparently still none-too-pleased about her younger brother's relationship according to a Thursday report from People.
Not happy: Khloe Kardashian, pictured in LA last week, is not pleased with her brother's engagement news according to a Thursday night report from People
Interesting: Her brother Rob Kardashian reportedly popped the question to girlfriend Blac Chyna on Monday after three months of dating
'Ever since Khloe found out that Rob is dating Blac Chyna, she felt betrayed,' a source told the weekly. 'This feeling has never changed. After finding out about the engagement, she is furious at the lack of respect.'
Rob famously put a ring on it on Monday to much fanfare on social media and the family is said to blindsided by the news.
Several members of the Kardashian-Jenner clan were enjoying a ski trip in Vail, Colorado as they jetted out the same night that the happy couple shared their engagement news.
The insider explained: 'She can't believe Rob didn't tell the family in advance. She thinks Rob is causing drama on purpose and wants them [his family] to be arguing.'
Ouch: the 31-year-old reality star - pictured with older sister Kourtney, 36, in Vail, Colorado on Wednesday night - is said to feel 'betrayed' as a source said: 'This feeling has never changed. After finding out about the engagement, she is furious at the lack of respect'
'She can't believe Rob didn't tell the family in advance': Khloe does not seemed pleased with the news according to the new report
Though Chyna's ex and boyfriend to Rob's half-sister Kylie Jenner, Tyga, has commented on the news, Khloe, Kris and the rest of the Kardashian clan have remained mum on it.
The source said: 'Khloe plans on ignoring the news. She is not going to send Rob any well wishes. She is not happy about the engagement, and is not going to pretend that she is.'
Khloe was the sibling who took a formerly reclusive Rob under her wing when he battled diabetes and cut himself out of the Keeping Up With The Kardashians family business, blocking himself off from most social contact.
Though Khloe is thought to have chucked Rob out of her house when he went public with his relationship with Chyna.
Showing it off: Chyna and 28-year-old Rob showed off her new jewellery during an outing in LA on Monday but the former Keeping Up With The Kardashians star apparently did not tell his family
Betrayal seems to be the key word in the drama as it was used in a similar report about the same situation in January.
'Khloe feels majorly betrayed by Rob after she always stuck up for him,' a source told UsWeekly. 'She feels like this is a major blow to the family. Nobody in the family likes it.'
Back in February Khloe used social media to try to repair the damage done in their relationship when she admitted that she missed her baby brother Rob in a sentimental post.
Sharing a youthful throwback snap to Instagram, Kardashian sister put her differences with new girlfriend Blac Chyna aside and reached out to Rob by posting the black and white snap.
The post, accompanied by three unhappy emojis, read: 'It's simple... I miss you' and saw Rob planting a kiss on his sister's cheek as she pouts down the lens.
Reaching out: Khloe displayed her loyalty to younger brother Rob Kardashian back in February when she posted this throwback image and said she missed him
Miss you: His new relationship with Blac Chyna has driven a wedge between the Kardashian family
Read more: http://www.dailymail.co.uk/tvshowbiz/article-3529374/Khloe-Kardashian-t-believe-Rob-did-not-tell-family-surprise-engagement-Blac-Chyna-furious-lack-respect.html#ixzz45D0smw9V
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