Michael Buble said he is "overjoyed and filled with gratitude" following the birth of his son.
Buble wrote, "Overjoyed and filled with gratitude at the arrival of our son Noah Buble. Born this morning, August 27th at 2.26 am in Vancouver, Canada."
Lopilato posted the same picture on her Instagram site with the message, "Full of light with the arrival of Noah Buble at 2:26 am on August 27. Blessed and happy with our son!"
Singer Michael Buble has told Daybreak's Aled Jones that "when I have children my priority will be my family."
Fans saw stars arrive to record Rod Stewart's Christmas Show at Stirling Castle earlier today.
Singer Michael Buble met fans he arrived ahead of his performance with Stewart in the ITV programme to be broadcast next month.
The singer is recording performances with Buble, Kylie Minogue and violinist Nicola Benedetti in the great hall of Stirling Castle.
He said: "Christmas comes early for me this year. I'm really looking forward to singing with Kylie and Michael and performing with Nicola.
"The show will be a real seasonal treat."
Tickets for the exclusive evening were distributed via a lottery with a dress code of "dinner jackets, kilts and cocktail dresses".
A Historic Scotland spokeswoman said: "We are delighted that Rod Stewart is hosting his Christmas special at Stirling Castle's great hall.
"It will be seen by millions of people across the UK and is a fantastic opportunity to showcase the beauty of this spectacular castle.
Michael Buble is to pick up the international prize at this year's O2 Silver Clef Awards.
He will be honoured by the music industry at the event in aid of music therapy charity Nordoff Robbins.
Other winners this year include Jessie J, Andrew Lloyd Webber and Laura Wright.
Buble, whose hits include Haven't Met You Yet, will collect the Raymond Weil International Award at the ceremony at London's Hilton Park Lane on June 29. He said of his award: "I'm thrilled to accept it, and I cannot wait to attend this wonderful event."