Singer Justin Timberlake says his son Silas' first word was "dada".

During an appearance on "The Tonight Show Starring Jimmy Fallon" on Wednesday, Timberlake said that he coached his son using the Fallon's new children's book titled "Your Baby's First Word Will Be Dada".

The "Sexy back" singer has certainly taken to fatherhood and believes becoming a parent to his son has been the best thing to ever happen to him, reports femalefirst.co.uk.

Asked how he would describe fatherhood, he said: "It is the most insanely amazing, wonderful, unbelievable thing to ever happen to you,"