10/06/2009 at 07:00 AM EDT
Dr. Phil McGraw is going to be a grandfather – and he will announce it on his TV show Tuesday, PEOPLE has learned.
This will be the first grandchild for Dr. Phil and wife Robin, and the first child for their 30-year-old son Jay and his wife, Erica McGraw.
Dr. Phil, 59, says he got the happy news during a recent trip to Europe. "We were actually vacationing with the whole family and were in Elba, Italy," he says. "Jay and Erica had discreetly gotten several home pregnancy tests the day before in France, and they sat us all down in Elba and said they had some exciting news! 'We are pregnant!' "
"The day before Robin had said to me, 'I just get the feeling that Erica is pregnant.' I swear she is some kind of mind-reader, but I guess women know these things."
The Doctor's reaction: "I was stunned and thrilled. I did not see it coming at all."
The grandma-to-be is excited, too. "This is my dream come true! I have lived to be a grandmother, and now I am," says Robin. "Phillip will be putty in this child's little hands!"
Chimes in the granddad-to-be: "I think Jay and Erica were totally ready and will make the best parents a child could ever want. I plan to be the typical doting grandfather that gets to do all the fun stuff and none of the tough stuff."