Singers Jana Kramer and Brantley Gilbert have reportedly ended their engagement.

The couple began dating in September, 2012 and became engaged in January (13), but the country stars have since parted ways due to their hectic work schedules, according to

A source says, "They are both so busy right now. They are both on the road and have to spend a lot of time apart, which isn't ideal for any couple, let alone a couple trying to plan a wedding."

Actress-turned-singer Kramer has been married twice before - her last union, to Christina Applegate's ex Johnathon Schaech, ended a month after their wedding in 2010.