WATCH: Kellie Harrington shocks Late Late viewers with stunning singing voice

Viewers of the special St Patrick's Day RTE Late Late Show were stunned as Olympic champion boxer Kellie Harrington sang a classic Irish ballad.

Coaxed by host Ryan Tubridy and special guest, actor John C Reilly, the gold medallist from Tokyo performed an acapella version of Grace.

The studio was stunned into silence by Kellie's beautiful voice. Afterwards, she turned to her partner Mandy and said, "I can't believe I've just done that on TV."

Twitter users were quick to react to the performance.