LeAnn Rimes and Eddie Cibrian are ready to tie the knot, E! News reports.

Sources claim the singer, 28, has accepted a marriage proposal from the actor, whom she began dating while she was still married to backup dancer Dean Sheremet in 2009.

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"What happened is not who I am, period," Rimes explained of her extramarital affair while appearing on In the Spotlight with Robin Roberts: All Access Nashville Wednesday. "But I do know how much I love [Cibrian]. So I've always said I don't live my life with regret. I can't."

Cheating aside, the singer told Roberts that "we're talking about something that's over a year, year and-a-half old, really, and we're still together, and we're madly in love."

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So did Cibrian -- who has two sons with ex Brandi Glanville -- hint at an engagement earlier this week?

The actor, 37, tweeted a photo of himself on bended knee standing next to Rimes on Halloween. But the following morning, Rimes told fans it was merely a joke.

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"Ok, it was a 'TRICK-or-treat right!" she tweeted. "@eddiecibrian and I were having a little fun...@eddiecibrian is WAY more romantic than to proper [sic] to me in front of a 'lunatic' sign. Just thought it was too funny not to share a little 'TRICK!'"

A rep for Rimes had no comment.

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