It seemed like only yesterday when the new Kardashian family addition, Blac Chyna, announced her engagement to Rob Kardashian, via Instagram. Along with her ring-finger donning a ginormous 7-carat rock, Friday (May 6), the couple posted an Instagram emoji of a look-a-like Blac Chyna with a huge baby bump, confirming their baby news. 👶🏽🎉 A photo posted by www.Lashedbar.co (@blacchyna) on May 6, 2016 at 11:14am PDT   The pregnancy promises to deliver Rob, 29, his first child, courtesy of the 27-year-old vixen, whom is already a mother to a 3-year-old boy with ex-boyfriend Tyga; who himself is currently dating a Kardashian via her fiance’s sister, Kylie Jenner.  Tabloids were tipped off in…