Blake says he's still "speechless" about it.
Blake's mom also hinted Katie was "dishonest" and "deceptive" during their engagement.
Katie and John's relationship comes just a month after she broke up with her "Bachelorette" winner, Blake.
He was originally eliminated on Week 2 of Katie's season.
Find out whether Katie and Blake's split was for a "bad reason."
She admitted she was "winging" their relationship three days before they ended their engagement.
Katie gave her final rose, but did she and her winner last?