Faith Hill joined 2015 ACM Vocal Group of the Year winners Little Big Town for a special performance at the 2015 Billboard Music Awards on Sunday night (May 17).

Hill paired with LBT to perform the foursome's current hit single, "Girl Crush," which saw an enormous sales spike following the group's performance at the ACM Awards. The song set the largest one-week sales figure for a country track in 2015 and has passed the threshold to be certified gold by the RIAA.

LBT singer Karen Fairchild started off the song, looking sexy in a red sparkly dress and thigh-high leather boots. Faith joined in on the second verse, which she delivered in a soulful lead vocal, clad in a sparkling black top and sporting her newly-short hair.

The song overcame an unusual controversy on its way to success. The Washington Post reported in March that the song was being dropped from stations all over the country because listeners who did not understand the song's lyrics accused Little Big Town of "promoting the gay agenda."

The group responded to the flap by recording a commercial explaining the lyrics of the song. Billboard later claimed that the controversy was "mostly fabricated" by its original source, an anonymous blogger at For the Country Record, but the site sticks by its source and the story.

The Billboard Awards performance marks a somewhat rare public appearance for Hill, who has mostly been out of the spotlight in recent years. She reportedly underwent an anterior cervical discectomy and fusion in January to relieve pain from a herniated disc, which may explain why the album she first announced in 2011 has not yet emerged.

Little Big Town Talk About "Girl Crush"