Rob Kardashian was so eager to get engaged he popped the question literally the minute he got the ring from the jeweler … and it happened so fast the jeweler saw the whole thing!
Ben Baller, who sold Rob the rock for $325k, told us Wednesday they’ve been friends for years, and he actually grilled Rob about his decision to marry Blac Chyna.
Turns out Ben witnessed the proposal.
One more interesting thing … Ben says it took him 5 days to get the ring ready. That really does make it look like Rob schemed to pop the question when his family was out of town.