The boyband probably haven't done many 21st parties
If you weren't a Westlife fan and you lived in the vicinity of superfan Brianna O'Connell's home in Donabate, Co. Dublin this weekend, you may have had to close your windows.
That's not because Brianna was blaring the boyband's music via a speaker - but because the foursome actually turned up to play in her back garden.
The performance was a competition prize that ran in 2020 as part of RTE Does Comic Relief - with the winner receiving a private gig by Westlife in a location of their choosing.
Sandra O'Connell won the prize and donated it to her niece Brianna, who celebrated her 21st birthday over the weekend.
Shane, Nicky, Kian and Mark played a short set for the superfan and her friends and family in a marquee set up in their back garden.
Westlife play the Aviva Stadium on July 8th, but this was a warm-up that they won't forget in a hurry.
Watch it below: