Dierks Bentley, Wife Having Baby No. 2

Dierks Bentley, Wife Having Baby No. 2
Dierks Bentley and Evie in 2009
Ann-Marie Hensley

07/22/2010 AT 12:30 PM EDT

The holiday season will be extra special for Dierks Bentley and his wife Cassidy this year – the couple are expecting their second child in December, the country star tells PEOPLE exclusively.

"We're so excited that our daughter Evie is going to get a baby sister or brother for Christmas," says Bentley, 35, who told PEOPLE when Evie was born that she made life "twice as big."

But, he says, no one's more eager for the new addition than the 21-month-old.

"She's pretty obsessed with a baby doll she carries around now ... We'll see how she does with the real thing!" Bentley says.

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