LeAnn Rimes. (Photo: Reuters)

Country singer LeAnn Rimes, 27, is divorcing her husband of seven years Dean Sheremet amid allegations that she is having an affair with actor Eddie Cibrian, her co-star in the film Northern Lights.

Ironically, Cibrian, 36, also filed for divorce from his wife Brandi Glanville last week citing irreconcilable differences. The couple has two sons: Mason 6, and Jake 2.

After much thoughtful mutual consideration, Deane and I have agreed to move forward with dissolving our marriage, Rimes wrote on her blog yesterday. This decision was amicable and we remain committed and caring friends with great admiration for one another. Thank you so much for all of your continued love and support - it is deeply appreciated.

Sheremet and Rimes separated in July, several months after the affair scandal exploded when US magazine published a video of Rimes and Cibrian on a date kissing. At the time, both denied the rumors.

However, in August, Rimes and Cibrian went public with their relationship and were spotted playing golf and a Kings of Leon concert in Los Angeles.