Kardashian made a show of solidarity by posting a video with Blac Chyna on Snapchat. The clip sees the star rub Blac Chyna's baby bump after telling fans, "Hey guys, it's going down in San Diego tonight."
Blac Chyna and the Kardashians gathered at The Marine Room in La Jolla, Calif., to fête Jenner's mom, M.J. Campbell. Rob wasn't seen in any of the photos or videos his family shared from the event.
Fans speculated Blac Chyna and Rob had split this week after Rob deleted all traces of the model from his Instagram. Sources later told Us Weekly the couple had an "explosive fight" but were still together.
"It was a fight, but they will be over it and basically are," an insider said. "They've been spending a ton of time together and filming a show together. Add to that the stress of a new relationship and it's inevitable that there will be some tension."
Blac Chyna and Rob got engaged in April after three months of dating and announced they're expecting the next month. The couple will star on the new E! series Rob & Chyna.