She will perform her new single, "Marry Me," with Train lead singer Pat Monahan while a couple from New Jersey gets married on stage. McBride handpicked Christina Davidson and her fiancé Frank Tucci to tie the knot during her performance in Las Vegas.
They both lost their spouses in 2009 and met at a support group for young widows and widowers that Davidson started in their community. Their friendship grew as they dealt with the challenges of being single parents and the struggle to keep their spouses' memories alive.
The ACM Awards air live on CBS April 1.
