After a prolific 2010, sisters Shelby Lynne and Allison Moorer plan to record their first collaborative album this year.

"We're starting to write in March and hopefully we'll put out a record next year," Lynne tells Billboard.com. "We're going into uncharted territory here. We'll see what happens. I expect it to be really good and really soulful. We're just a couple of singers who happen to be sisters...getting together to write songs and see what we can do together."

The album is an outgrowth of a tour the two did late last year, which Lynne says was an "excellent" experience for all concerned. "We loved it, people loved it," she reports. "It was just the two of us on two guitars. Having not written anything yet we did each other's songs and reached back into our childhood and grabbed a couple of things that we grew up singing. It worked brilliantly. We both like to tell stories and cut up and have fun and go with the flow...We don't fight. I know everybody would love that to be the case, but that's not the way it is, and I don't see anything like that happening."

Lynne is coming off a 2010 in which she released her 11th studio album, "Tears, Lies and Alibis," as well as her "Merry Christmas" collection, both on her own Everso Records imprint. Moorer, meanwhile, released her own album, "Crows."

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Besides working together, Moorer will be touring as part of her husband Steve Earle's band this year (she performers on his forthcoming new album, "I'll Never Get Out of This World Alive"), while Lynne says she's "about halfway written" her followup to "Tears, Lies and Alibis," although she may seek another label deal this time out.

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"Everso is definitely still in the mix," she says, "but when we do the record we're going to bring in another label so there's more money. That's down the road a bit, though."