Bridesmaids belt out surprise medley at sister's wedding

It’s a great effort, but warning they REALLY can’t sing.

Kelsey and Maddie Hallerman delivered a performance to remember at their sister Caitlin’s wedding in Lake Tahoe, California.

The co-maids of honour wanted to do something special for their sister’s wedding to her new husband Johnny Weaver, so they took a medley of popular songs and customised the lyrics to fit the occasion.

Speaking on their performance to buzzfeed.com Maddie admitted: “We didn’t hold back (sorry to everyone’s eardrums). What we lack in talent we make up for in enthusiasm.”

As for the bride Caitlin she expected nothing less from her kooky sisters.

“They honestly are this ridiculously funny all of the time, so I can’t say I was super surprised that they pulled something like this off. But it was more than I could have ever expected or hoped for,” said the new bride.

While they are far from the best singers in the world, we have to say we loved the Sister Act part!