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Rascal Flatts' Joe Don Rooney is now a father of three.  People says the country star and his wife, Tiffany Fallon, are celebrating the birth of daughter Devon Olivia, who made her entry into the world a few days later than expected. 

She was due last Thursday but arrived Monday evening in Nashville, tipping the scales at a healthy six-pounds, eleven-ounces. 

Joe Don and Tiffany say they're "so thrilled to finally become a party of five," and their other children are "so happy" to have a little sister.  Devon's siblings include a six-year-old brother, Jagger, and four-year-old sister, Raquel Blue.

Congrats to Joe and family! 

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