The singer said she knew that a video of the kiss would end up on YouTube so she gave the audience permission to upload it.
The boy she kissed, named Chase, was holding up a sign saying “will you be my first kiss?” Underwood spotted the sign and got the boy up on stage.
“OK, how are we going to do this?” said Underwood to the boy. “Lip to lip,” said the cheeky 12-year-old.
Underwood followed through and gave him a big smacker on the lips, as the crowd went crazy.
She’ll have signs begging her for kisses at her gigs for evermore no doubt.
Picture: Getty Images