The singer shares his secret in his upcoming book, Hindsight & All the Things I Can’t See in Front of Me, out later this month.
In the book, the “Sexy Back” singer, 37, said he was instantly attracted to Biel, 36, when they first met at a Hollywood party years ago. But it wasn’t until the second time they saw each other that he asked for the 7th Heaven star’s number.
After weeks of chatting on the phone and attending the same Golden Globes show, the two decided to date – but not exclusively!
“We were both still seeing other people, keeping ourselves safe from getting hurt, from really putting ourselves out there,” Timberlake confessed.
The former NSync singer said that after “a bit” of dating, they ultimately decided to only see each other.
On Friday, the two celebrated their sixth wedding anniversary. They share one son, Silas, 3.
Also in his memoir, Timberlake explained how being a father changed his life. Earlier this year sources spilled to Radar that the couple is desperate for another baby in order to save their marriage.
What do you think of Justin’s cheating shocker? Sound off in the comments!
We pay for juicy info! Do you have a story for RadarOnline.com? Email us at firstname.lastname@example.org, or call us at 800-344-9598 any time, day or night.