The reality realtor confirmed that the new couple "seem very happy", but conceded that she'd only met them together a few times.
As for whether or not Hall would make good step-dad material, she admitted "I don't know, I don't know him that well."
Despite splitting five years ago, Tarek and Christina remain co-stars on their hit HGTV show "Flip or Flop", while also co-parenting their two children — meaning time in each other's company can't really be avoided.
However, Young draws the line at double dating: "I don't think so," she smiled when asked if the foursome would ever head for a night out together.
After Christina split from Tarek, she went on to marry UK TV presenter Ant Anstead and even conceived her third child with him; sadly the marriage didn't last two weeks beyond the baby's first birthday, and they announced their separation in September of last year.