They also forgot to tell Florence herself she'd be making her debut.
"'My face when I saw myself unexpectedly in tomorrow's teaser just now," Flo captioned an Instagram snap of herself looking surprised.
She added that the, "Cat's out of the bag - back on @bachelorinparadiseau and ready to rumble."
In the teaser, Bill Goldsmith's love interest Alex Nation can be seen wandering around the pool looking for her man.
The scene then cuts to Bill planting a kiss on Flo in a hot tub!
Naturally, chaos ensues when he arrives back at the villas, but it's his foul-mouthed tirade that makes the next episode the one to watch!
Alex confronts Bill over a conversation she's had with another female in Paradise, to which he replies, "f***ing salty b**ch' and a *f***ing conniving piece of s**t."
As for who he's slamming, stay tuned...