"She is a very smart and very cerebral woman," Chris said when announcing Matt's cast of bachelorettes in a Facebook Live video.
"[She had] a bit of a slow roll, I'm not going to lie... in the romance department, but once she gets there, there is no turning back for this woman and she is all in!"
Chris added, "Speaking of 'all in' with Pieper, this woman has zero of a poker face. You meet people who can really fool you sometimes and play things down -- Pieper is the other. She's that girl, what you see is what you get, and she cannot fake it at all."
Chris concluded that producers "loved" Pieper and she was "one of the more dynamic women" the show has had in a while.