Dave Haywood of the band Lady Antebellum and Kelli Cashiola

Dave Haywood of the band Lady Antebellum (L) and Kelli Cashiola attend the 2013 CMT Music awards at the Bridgestone Arena on June 5, 2013 in Nashville, Tennessee.

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Lady Antebellum's Dave Haywood is the latest member of the country trio to be expecting their first child: on Monday, Haywood and his wife Kelli announced that they will have their first baby together in September.

"So excited for a new Baby A on the way in Sept! And it's a boy!!! -Dave & Kelli," a Twitter post from Lady Antebellum read. Lady A singer Hillary Scott, who gave birth to a girl last summer, promptly tweeted in response, "WOOHOO!!!!!!!!"

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Haywood married Kelli in April 2012, after the pair got engaged at the end of 2011. Scott and Nashville-based drummer Chris Tyrrell also married in early 2012.

Lady Antebellum released its fifth studio album, "Golden," last May, and the full-length debuted atop the Billboard 200 albums chart. The group will be performing through North America this spring and summer, with its next show scheduled for Friday (Apr. 25) in Raleigh, N.C.