Justin Timberlake ended his tour early after he found out his wife Jessica Biel was expecting their first child.

The Suit and Tie hitmaker and Jessica became first-time parents to son Silas in 2015 and in his new book, Hindsight & All the Things I Can't See in Front of Me, Timberlake reveals Biel told him he was going to be a father over the phone in the middle of his 20/20 Experience Tour.

Timberlake reveals his wife was set to visit him on the road after they had been apart for over a week, but she couldn't wait to tell him the happy news.

"I was on the 20/20 Experience Tour when my life changed forever," Timberlake writes. "I was in Detroit and pulling a week or two by myself because my wife was in Los Angeles, but was coming to visit me in a few days. I had just finished a show, and I go into my car and took my phone out. There was a text from Jess, in all capital letters. It read 'Call Me Now'.

"I FaceTimed (video chat) her back immediately. She answered with this look on her face, and I knew exactly what she was going to say. Instead, she just held up the pregnancy test, and we both started bawling."

"I ended the tour early so I could be at home and take care of my family," he adds. "My last show was in Las Vegas, on January 2, 2015. Three months later, I was a father."

And fatherhood has changed Justin in ways that he couldn't imagine before becoming a parent.

"The things I have learned from being a father have been profound," he continues. "It's made me look at relationships in a new way. It's made me think about who my parents are as people, and how that affected me then and has contributed to who I am now - and how all that might affect my child. It makes me wonder how my son will see me when he grows up. It makes me want to be more thoughtful."