June 18, 2012 11:15 AM

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Nearly seven months after getting married, Jennifer Nettles has plenty to sing about: The Sugarland singer is pregnant.

It will be the first child for the Duets mentor and her husband, entrepreneur Justin Miller.

“They are thrilled beyond belief,” Sugarland’s manager, Gail Gellman, tells PEOPLE.

The Grammy winner, 37, is due in November, Gellman says, which will coincide with the couple’s first anniversary since their sunset wedding ceremony outside Nashville, in which Nettles dazzled in an Alexander McQueen gown at a chapel nestled in the foothills of the Smoky Mountains.

Nettles and Miller met in 2006 and dated for more than two years before becoming engaged.

— Alison Schwartz with reporting by Katie Kauss

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