The 'Down With The Trumpets' performers say they are "over the moon" about having a slot on the line-up.
Rizzle Kicks Jingle Bell Ball 2012
The likes of US superstar Bruno Mars, nation's sweetheart Cheryl Cole and boy band sensation One Direction all performed.
Watch the moment Jordan and Harley can't believe their eyes during what they call a "sick" card trick.
The 'Down With The Trumpets' stars covered the festive hit 'Santa Claus Is Comin' To Town' for their set.
Jordan and Harley hook-up with Lawson and JLS during a whirlwind tour of the dressing rooms.
The 'Mama Do The Hump' duo had the crowd on their feet at the 2012 Jingle Bell Ball. See pictures of Rizzle Kicks' set here.
Join Capital as we countdown to this year's Jingle Bell Ball by taking a look at how all the biggest names in hit music are preparing for the event at London's O2 Arena.
To get you all ready for this years Capital FM Jingle Bell Ball, check out some of the facts and figures that define this year's incredible line-up of artists.