07/14/2014 AT 8:00 PM ET
She may not look like a grandma, but Real Housewives’ Tamra Barney couldn’t be more excited about her new title.
The reality star’s eldest son Ryan Vieth, 28, and his fiancée Sarah Rodriguez are expecting their first child, Vieth confirmed Saturday.
Before appearing on Monday night’s episode of Watch What Happens Live, Barney, 46, posted a picture of a sonogram on her Facebook page with the caption “@bravoandy we’ve got something to talk about tomorrow night. Thank you Jesus #blessing.”
The baby news comes just months after the couple got engaged. “Ryan’s getting married. He better shave!!!!!” Barney posted on her Instagram page in April.