Justin Timberlake and Jessica Biel's son Silas says his first word "dada" after Justin coached him using Jimmy Fallon's new children book, 'Your Baby's First Word Will Be Dad.'

Justin with his son Silas

Justin with his son Silas

The 'Friends with benefits' star has certainly taken to fatherhood and believes that becoming a parent has been the best thing to ever happen to him.

Five month old Silas has bonded with him more than anyone else, the 34-year-old singer claims.

During an appearance on 'The Tonight Show Starring Jimmy Fallon' on Wednesday (09.09.15). Justin revealed he had coached his son using the presenter's new children's book, 'Your Baby's First Word Will Be Dada,' which follows the story of a father trying to coax his daughter into saying dada while meeting a number of animals during a fun adventure.

Justin was asked how he would describe fatherhood, he said "It is the most insanely amazing, wonderful, unbelievable thing to ever happen to you."

Meanwhile, although the Grammy-award winner is one of the world's best known singers, his wife Jessica previously revealed that she is on lullaby patrol for baby Silas because Justin doesn't want to bring his work home.

She said last month "You know, it's hard when it's your business. You don't always bring it home and use that as your casual time. I sing to the baby, poor thing. I do a lot of 'Somewhere Over the Rainbow'."

by for www.malextra.com