The most insanely amazing thing to ever happen': Justin Timberlake hails fatherhood and reveals son Silas' first word

He has found phenomenal success as a singer, actor and a businessman.

But Justin Timberlake revealed becoming a father is the most amazing thing to ever happen to him during his appearance on The Tonight Show on Wednesday.

The Yogi Bear star gushed about how much he is loving being a parent for the first time to his son Silas, who was only born back in April.

Friends with benefits: Justin Timberlake announced his son's first word was 'dada' on close chum Jimmy Fallon's Tonight Show on Wednesday

The A-lister said: 'It is the most insanely amazing, wonderful, unbelievable thing to ever happen to you.'

But he was not finished there, as he had brought the bombshell news on what his boy's debut word was.

As if life could get any sweeter for the SexyBack singer, he said the five-month-old had said, 'dada' when he spoke for the very first time.

The daddy union: Justin revealed he coached his son using Jimmy's book Your Baby’s First Word Will Be Dada

The dad club: Jimmy and Justin share a 'bro' moment

Of course it may have been something of a foregone conclusion, as the shameless star had been priming the boy with Jimmy's picture book Your Baby’s First Word Will Be Dada.

The thrilled pair celebrated their success by pumping their hands in victory. 

Justin also made sure there was plenty of images for his friend Jimmy and his fans at home to gawk at.

The first showed the delighted pop star holding his boy, while a second featured his beautiful wife Jessica Biel holding her son.

Please don't Cry Me A River: Justin shared this adorable picture of himself watching golf with hisSilas

The next Colin Montgomery: Justin joked his boy is already adept at putting despite having an awful swing

Pride and joy: He also showed off his beautiful wife Jessica Biel drying their son after a bath