Briana Wolfsmith and Vicki Gunvalson at a red carpet event hosted by Britax and Ali Landry at the SLS Hotel on September 8, 2012. Credit: Tammie Arroyo / AFF-USA.COM

Briana Culberson's son couldn't wait to meet his parents!

Real Housewives of Orange County star Vicki Gunvalson's daughter welcomed a baby boy September 28, three weeks ahead of schedule, Us Weekly can exclusively confirm.

"Troy William Culberson was born a healthy 7 lbs, 11 ounces at 7:53 a.m. this morning via emergency C-section," a family rep says.

This is the first child for nurse Briana, 25, and her husband, Ryan, a U.S. soldier who fought in Afghanistan. The couple eloped in Las Vegas in October 2011.

The rep tells Us, "Briana and Ryan are overjoyed with their newest addition to their family and are eager and excited to begin their new lives together."

This is also the first grandchild for Gunvalson, 50, also mom to Briana's brother, Michael, 26.

The couple chose the middle name William to honor Wolfsmith's late maternal grandfather. Ryan was by his wife's side during the delivery; an excited and overwhelmed Gunvalson, meanwhile, "couldn't stop crying."