Country songstress LeAnn Rimes has revealed she felt "pathetic" while having an affair with her now husband.

The singer appeared on The Tonight Show With Jay Leno to debut new song 'Borrowed,' which she admitted is based on her affair with her now husband and Brandi Glanville's ex, Eddie Cibrian.

She explained: "The song is about the situation. I did go through a very public affair with Eddie, who is now my wonderful husband."

She added: "I call myself pathetic in the song, because at that moment, I was pathetic. A lot of people who have been in that situation can relate to that...it kills me to give that up. It's a very intimate look into a very rough moment of my life."

Rimes also explained that the track "looks into the darker moments of things."

30-year-old Rimes checked herself into a treatment facility back in August to address her anxiety issues, and has previously spoken about her struggle with stress.

She said: "I’ve been in therapy my whole life. I like going. I like being able to have that third-party input and someone to listen that has nothing to do with your life."