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"A few years ago when I was newly married and recently elected to Congress, I remember fielding some speculation as to whether or not I was 'expecting.' Well… my husband Dan and I are thrilled to announce that this fall, there will be yet another person in Southwest Washington who will — for their entire adult life — get to explain 'No, no, it’s pronounced Butler.' That’s right — we’re expecting a baby!" she wrote.

She did not indicate when the baby is due.

The two-term lawmaker is a former aide to Rep. Cathy McMorris RodgersCathy McMorris RodgersDems look to Seattle for next special election win Charities push GOP for tax reform change Trump, GOP lawmakers struggle with messaging MORE (R-Wash.).

McMorris Rodgers, who has had two children while in Congress, announced her last pregnancy — in August 2010 — via Twitter.