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18 March 2013, 13:25 | Updated: 18 March 2013, 13:30
The 'Taking Over Me' stars paid homage to the UK singer during her charity head shave.
Lawson did their bit for Comic Relief over the weekend when they dressed up as Jessie J live on stage on their 'Chapman Square' UK tour.
The 'Learn To Love Again' four-piece performed a sold out show in Cardiff on Friday night (15th March) and accepted the 'Domino' singer's challenge to do a dare during their show.
Andy, Joel, Ryan and Adam emerged on stage dressed up in Jessie's trademark leopard print catsuits, black bob wigs and performed a cover of her hit song 'Price Tag' as part of the challenge, in honour of Jessie's Comic Relief head shave on the same night.
"We love Jessie, " Andy revealed. "She raised an incredible amount for the charity and we wanted to do our bit as well."
Despite enjoying their change of stage attire for the night, 'Taking Over Me' singer Andy admitted their Jessie J outfits aren't likely to resurface any time soon.
Check out a picture of Andy on stage as Jessie J below:
"I'm not sure the catsuits will be back again," he added. "We don't look as good in them as she does. But it was a good laugh for a great cause."
Lawson drummer Adam Pitts gets suited up as Jessie J during the band's tour:
Lawson's 'Chapman Square' UK tour has seen them perform up and down the country over the past month.
Watch Lawson dressing up as Jessie J and performing 'Price Tag' live below: