It's a Kings of Leon baby boom.

The band's drummer Nathan Followill, 33, announced Wednesday that he and his wife, singer Jessie Baylin, are expecting a baby.

"I can proudly announce that me & the lovely @JessieBaylin are expecting our first child. I'm beyond excited/anxious. Life is beautiful," he tweeted to fans.

Followill's younger brother Caleb, the group's lead singer, just welcomed a baby girl, Dixie Pearl. His supermodel wife, Lily Aldridge, gave birth at Vanderbilt University & Medical Center in Nashville June 21.

Meanwhile, the younger Followill brother, Jared, 25, is set to soon wed his model girlfriend Martha Patterson.

The pair announced their engagement in May.