Emily Robison, Natalie Maines and Martie Maguire
01/27/2008 at 08:00 PM EST
Dixie Chick Martie Maguire is pregnant, she told PEOPLE on the red carpet for the Nobelity Artists & Filmmakers Dinner in Austin to benefit the Nobelity Project Sunday.
"I'm very excited," Maguire, 38, says, adding, "We know what it is – it's a girl."
Maguire, 38, is married to Gareth Maguire, an actor. Their first children together were twin daughters Eva Ruth and Kathleen Emilie, who were born in April 2004. "I'm feeling good now, although I wasn't!" Maguire jokes. "Carrying one instead of two will be much easier."
In regard to the growing brood between her and the rest of the Dixies – Natalie Maines and Emily Robison – Maguire says, "We'll have to move over and let the little chicks take over! We've got a new band!