The Sugarland singer tied the knot with entrepreneur Miller in a private ceremony held at a chapel in Tennessee's Smoky Mountains on Saturday, reports People.
Nettles wore an Alexander McQueen gown as she walked down the aisle surrounded by family and friends including bandmate Kristian Bush.
The couple began dating in 2009 after meeting years prior when Miller appeared in Sugarland's 2006 video for 'Want To'.
Sugarland were recently sued by victims of the Indiana stage collapse who blamed the band for the tragedy, which killed seven and injured more than 45 people in August.
The group put on a free memorial show last month at the Conseco Fieldhouse in Indianapolis in honour of those who died.
Watch the video for Sugarland's 'Tonight' below: