As mentioned before, Super Junior will perform at Music Bank on 25th December. And now the two rookies group will have a joint performance together too. The first time both of the group perform together on stage, i think their performance will be very awesome and the best christmas gift for us! This had been announced by Cube Intertainment below. 
Hello.
This is CUBE Entertainment.

December 25 (Friday) on KBS Music Bank,
for the Christmas Special, we are expecting to have a joint BEAST&MBLAQ performance.
We've updated their schedule, and people who want to attend should look at the information below.

 ( KBS Music Bank Participation Notice )

Day & Time: December 25 2009 @ 6:40 PM
Location: KBS ShinGwan GongGae Hall

[other information]


Credits to illuminate.@B2ST Rising (TRANS) playb2st (SOURCE);