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8 December 2012, 11:27
The 'When She Was Mine' singers call it a "dream" to be performing at the music extravaganza today.
Lawson have taken to the stage inside London's O2 Arena to soundcheck ahead of their debut performance at the Jingle Bell Ball.
The 'Taking Over Me' stars donned their winter outfits on a chilly morning in the capital and have been Tweeting all week about their excitement for today's event.
Last night Ryan Fletcher tweeted: "Capital fm jingle bell ball tomorrow... What a dream gig been to see it for years and now we are gonna rock it's jingle bell balls off!!"
The band perform on a line-up today which includes the likes of Bruno Mars, JLS, One Direction, Rizzle Kicks, Cheryl Cole, Little Mix and The Script.
Tomorrow (9th December) will feature the likes of Pink, Girls Aloud, The Wanted, Rita Ora, Conor Maynard, Calvin Harris and Example.
Check out a picture of Lawson drummer Adam Pitts taking to the sticks as he practices ahead of the band's performance below: (Picture: Twitter)
Keep your eyes and ears on the ball by visiting our special Jingle Bell Ball area as we come live from this year's event across the weekend.
You can see all the latest news, pictures, interviews and watch this year's performances on Capitalfm.com - follow the action in real time on our live blog.
Join the conversation about this year's Jingle Bell Ball by following @CapitalOfficial on Twitter with the hashtag #CapitalJBB and liking us on Facebook.