Singer John Farnham has publicly revealed his joy over the birth of his first grandchild, saying he is “over the moon” to welcome the new arrival.

The Burn For You and You’re The Voice crooner’s youngest son James and his partner Tessa Effendi welcomed their newborn son, Jett, into the world at 5.26pm on Wednesday, June 18, at St Vincent’s Private Hospital in Melbourne.

The infant weighed just 3.176kg.

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“We are over the moon about the arrival of this perfectly beautiful little boy,” Farnham and his wife, Jill, said.

“He’s already filled our hearts with so much love and we’re so proud and happy for James and Tessa. Welcome to the world, Jett!”

The sweet message followed the birth announcement from Jett’s parents.

Crooner John Farnham and wife Jill have shared a sweet message following the birth of their first grandchild, a son for James and Tessa. Credit: Instagram

“We thought we were excited to meet him — but turns out he was even more excited to meet us, arriving a little ahead of schedule,” James and Tessa wrote.

“Jett is our whole world in one tiny, noisy, perfect package. We’re smitten, we’re sleep-deprived, and we wouldn’t have it any other way.”

Farnham underwent a 12-hour surgery for throat cancer, with doctors removing a tumour from his mouth and reconstructing his jaw In August 2022.

He has since received an “all clear” regarding the cancer.

In February this year, James spoke of his famous father’s health.

“He’s doing great, he’s doing really well, walking around, kicking goals .... annoying mum,” James said with a laugh, as he spoke to hosts Natalie Barr and Matt Shirvington on Sunrise.

James also revealed Farnham had already decided what grandfatherly name he wanted to go by, choosing “Pa”.