Justin Bieber and Boyz II Men are on the week 7 results show - I'm unsure about the connection with Halloween!
On All Hallows Eve (8.30ET/7.30c) the six remaining couples with be dancing individually, and then performing in a team dance, three couples in each team.
Team Tango's J.R & Karina, Nancy & Tristan and David & Kym, dancing to Rihanna's "Disturbia," battle Team Paso's Ricki & Derek, Hope & Maksim and Rob & Cheryl, dancing to Evanescence's "Bring Me to Life." There will be a Halloween theme throughout.
Then on the reults show Justin will be singing "Fa La La" from his Christmas album (my, how they start young!) together with Boyz II Men. He'll also sing "Never Say Never".
And then a couple will be banished from the ballroom!