Sorry, ladies -- it seems that the last remaining single member of Lady Antebellum, Dave Haywood, is officially taken. According to his rep, things are getting serious for Haywood and lady friend Kelli Cashiola, who looked especially comfortable together at the BMI Awards on Tuesday evening.

Haywood confirmed his relationship to PEOPLE and said that he couldn't be happier dating Cashiola, who has been a good friend of his for five years. "I feel so lucky that our long friendship has grown into this relationship," the Lady A star gushed. "We are totally comfortable and ourselves with each other."

We can't imagine that there are many girls better suited for the 29-year-old Nashville artist than Cashiola, who also works in the music industry for a living doing marketing for Warner Music Group.

The pair are only six months into the dating stage, but if things go well, Haywood could be the next member of the Grammy-winning Lady Antebellum trio to tie the knot -- after Hillary Scott, of course.

The band is up for Vocal Group of the Year at tonight's 2011 CMA Awards.