12/19/2013 AT 05:45 PM EST
Christmas has come early for Marie Osmond – the singer became a grandmother on Wednesday night.
"Hey everyone …..I just became a GRANDMA!!!!!!!!" she Tweeted
, adding two minutes later, "It's a boy!"
It's the first child for her eldest son Stephen Craig and his wife, Claire, and the first grandchild for the 54-year-old, who remarried
Stephen's dad, Stephen Sr., in 2011, after divorcing in 1985.
Osmond revealed that she was going to be a grandparent back in June
, during an appearance on The Talk
"I'm going to be a grandma. And I just can't wait," she said. "We went in for my son – for his birthday – he turned 30, which is amazing cause I'm 29. He blew out the candles and then blew me away and said, 'You're going to be a grandma!' So, it's really fun."