The claws come out!

As if proposing to your sister's boyfriend's baby mama isn't bad enough, Rob Kardashian is now throwing shade at half-sister Kylie Jenner's famous lip kits.

RELATED: Bette Midler Makes Fun of Rob Kardashian's Engagement Just Weeks After Dissing Kim's Naked Selfie!

The 29-year-old reality star recently shared a clip of his fiancée Blac Chyna's Lashed Liquid Lipsticks on Instagram, completely ignoring the fact (or simply not caring) that her biggest competition is his sibling!

Seeing as none of his sisters have publicly congratulated him on his engagement, it's no surprise that the KUWTK star is slowly separating himself from his famous family.

RELATED: Is Blac Chyna Pregnant Already? See the Pics That Have Fans Talking

Earlier this year, the only son of Kris Jenner insulted the whole clan on social media, sharing a since-deleted meme that said, "When the p–y good but your family don't like her so you drop your family and become an orphan."

We're interested to see how this engagement progresses…