Rob Kardashian and Blac Chyna are seriously on the outs, and Kylie Jenner got caught in the cross fire when she planned a baby shower for Rob sans Chyna ... TMZ has learned.
Sources close to the Kardashians tell us Rob got pissed at his sisters Monday -- especially Kylie -- for what he considered a slap in the face ... the Chyna-free shower they were throwing. We're told the sisters only planned separate his and hers showers because Rob and Chyna haven't been speaking for months.
They briefly reunited for a dinner the night before their reality show premiered, but other than that ... they've been split.