December 12, 2015 12:10 PM

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David Nail is a dad!

The country singer and his wife Catherine welcomed twins, a boy and a girl, on Saturday, Dec. 12 in Nashville, his rep confirms to PEOPLE.

Son Lawson Brent Nail was born at 7:44 a.m., weighing in at 6 lbs., 2 oz., while daughter Lillian Catherine Nail arrived at 7:45 a.m., weighing 5 lbs., 14 oz.

“No words can describe the feeling,” the couple tell PEOPLE. “Beyond worth the wait. We are crazy in love with them both.”

The “Whatever She’s Got” singer and Catherine, who wed in 2009, broke the news about her pregnancy in November when they hit the red carpet at the CMA Awards.

At the time, Nail revealed to PEOPLE that Catherine could give birth “any minute now, but hopefully in the next four weeks two little things will pop out of this belly.”

“On his new record he has a song titled ‘Fighter,’ and I think it just really parallels nicely with our story. We struggled with infertility for years and just really had to stick together and fight through it,” Catherine added. “It wasn’t easy.”

Courtesy Nail Family

The pair is already getting parenting advice, and said they’re taking it in stride.

“Everyone tells us instincts take over and that’s what we’re hoping,” Nail, whose new album Fighter will be released in early 2016, said.

E! was first to report the happy news.

— Lindsay Kimble

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