From Ireland, no less.
This happened in February. The YouTube listing notes:
What a surprise this was for the bride and groom just after they exchanged their marriage vows at their wedding in Kincasslagh, Co. Donegal. This was well organised by the bride’s friend Gavin Boyle and with a host of local celebrities – Daniel O’Donnell, Majella, Derek Ryan, Tony Kenny, Shaun Cuddy, Tony Allen and more all sang choruses of ‘How Great Thou Art’.
The Bride and Groom – Neil and Tricia Swan, as well as many members of the congregation were left in tears and had everybody on their feet at the end.