I don't believe that the montage is from yesterday. Joe, Rose and Rex are all in identical clothes to what they are wearing when Stacey was hoovering earlier. Zach, bless him, is obviously looking at the camera for direction during the group hug.
Edited to add: so chronologically, Stacey supposedly takes the pictures in the room yesterday with Joe in trackies, Rose in a white bunny outfit and Rex in the slogan tee. Then in the sister's clips on Instagram we see that at the party that evening Joe is wearing jeans & a black tee and Rose is in a pink outfit. Then this afternoon the three are back in yesterday's clothes whilst Stacey is hoovering??