"So excited! Just found out baby #2 is a BOY!" the proud grandmother shared with fans via Instagram.
The Bravo reality star shared an image of her pregnant-again daughter, 26, son-in-law Ryan Culberson and the couple's 15-month-old son Troy standing among blue balloons marked with the words "It's a boy."
Last season on RHOC, Briana and Ryan welcomed their first son, who was born in September 2012, via emergency C-section.
Briana is Gunvalson's daughter with first hubby Michael Wolfsmith, and has been featured on Bravo's Real Housewives.
Gunvalson and her daughter appear to be in good terms again. As Housewives fan may recall, Briana confronted her mother about on-and-off boyfriend Brooks Ayers on the reunion, saying she won’t let her family around the man because of his penchant for “very shocking and extremely disrespectful” behavior.