The reunion doesn't air until later this month on ABC, but Rachel has teased it's going to be dramatic, emotional, and even volatile at times -- and that fans should brace themselves.
"As far as the taping goes, I was sitting there with Gabby. Obviously we came off a very, very messy season, and I thought our After the Final Rose was pretty messy and pretty bad," Rachel told Becca Kufrin and Michelle Young on a recent episode of the "Bachelor Happy Hour" podcast.
"But this, I think this has to be, probably, the messiest reunion that's ever going to happen!"
The flight instructor continued, "The amount of people that were just, like, coming at each other's necks -- whom you would never expect -- I was like, 'Where is this coming from?!' It was absolutely crazy."
Rachel confirmed love stories will definitely come out of this season -- and maybe even some "rekindling" -- but she suggested "The Split" twist was likely to blame for all the tension she had witnessed on the stage that day.
"This time, I think maybe the switch week might have played a part in that, them not having as much as time together, but there is of course still gonna be love at the end of the day," Rachel shared.