'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.

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

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 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

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

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

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

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

Explaining his snap, the former 'N Sync star said: '‘We were watching the PGA championship. (He's a) good putter. We’re working on his swing, but his putt is great.’

But it was not all sentimental chatter on the show, for the dynamic duo also performed the latest installment in the History Of Rap skit. 

This time the likes of N.W.A, Jay Z, Drake and even Salt-N-Pepa were included.

Jimmy was in typically fine spoof musical form, including a moment Justin had to pull back Jimmy who appeared to get a little too into character as he swore and looked menacingly at the camera.

Backstage: The dynamic duo kicked off the latest installment of the History Of Rap behind the curtain

Backstage: The dynamic duo kicked off the latest installment of the History Of Rap behind the curtain

And they're off: It was not long before they kicked off their comedic display in earnest

And they're off: It was not long before they kicked off their comedic display in earnest

What a thrill: The pair marched out purposefully as they spat out some rhymes

What a thrill: The pair marched out purposefully as they spat out some rhymes

‘Jimmy, we’ve been through this before,’ Justin told him. ‘You are not straight out of Compton! You're straight out of Upstate New York.’

They then segued into Salt-N-Pepa’s Let’s Talk About Sex, MC Hammer’s U Can’t Touch This and The Fresh Prince’s Summertime.

They finished with The Beastie Boys’ Fight For Your Right, which led to Jimmy breaking from tradition to crack a political joke at Hillary Clinton’s expense.

Getting carried away: Jimmy got too much into character and almost attacked the cameraman during the N.W.A segment

Getting carried away: Jimmy got too much into character and almost attacked the cameraman during the N.W.A segment

'You're straight out of Upstate New York': Justin tried to make his friend see the error of his ways

'You're straight out of Upstate New York': Justin tried to make his friend see the error of his ways

Excuses, excuses: Jimmy mumbled something about how popular Straight Outta Compton is

Excuses, excuses: Jimmy mumbled something about how popular Straight Outta Compton is

After complimenting the stamina he added: 'I’m still sweating like Hillary does when you ask to look at her emails.’

There was an even deeper insight into the pair's bromance as it emerged Justin had created a tequila cocktail called The Fallon, and it was revealed that 'as a joke' they had coffee mugs printed of each other.

It started with Justin taking a photograph of himself drinking from a mug Fallon had at his house with his own face on, with Justin saying he was ‘literally attempting to make your face’ as he posed.

And they're off again: It was not long before they were continuing their cringe-worthy medley

And they're off again: It was not long before they were continuing their cringe-worthy medley

Crowd-pleaser: The excitement went up more than a few notches when the host mingled with his fans

Crowd-pleaser: The excitement went up more than a few notches when the host mingled with his fans

Showing him how its done: But former NSYNC star Justin really knew how to work the audience

Showing him how its done: But former NSYNC star Justin really knew how to work the audience

Fighting for their right: The Beastie Boys would have been proud at the crowd's enthusiasm

Fighting for their right: The Beastie Boys would have been proud at the crowd's enthusiasm

Jimmy countered this with an image of Justin drinking the mug printed on another mug - and then another mug, this time with a photo of Jimmy drinking from the mug that had a photo of Justin drinking from the mug with Justin’s face on it.

After standing to clap at the gag, Justin said: ‘Christopher Nolan, if you’re watching right now … This is the Inception mug.’

What a mug: The jocular pair revealed they are so close they even have cups with each others faces on

What a mug: The jocular pair revealed they are so close they even have cups with each others faces on

The Inception mug: Jimmy took a picture of himself holding a mgug which contains a picture of Justin holding his mug embossed with Jimmy's mug

The Inception mug: Jimmy took a picture of himself holding a mgug which contains a picture of Justin holding his mug embossed with Jimmy's mug

You've taken it too far: On the show Justin produced his own mug showing Jimmy with his mug of Justin holding his mug featuring his friend's mug

You've taken it too far: On the show Justin produced his own mug showing Jimmy with his mug of Justin holding his mug featuring his friend's mug

Fancy meeting you here: His fellow NBC star Ellen DeGeneres showed up for a Lip Sync Battle

Fancy meeting you here: His fellow NBC star Ellen DeGeneres showed up for a Lip Sync Battle

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