"We didn't kiss for a very long time because he was on tour, and we were talking on the phone, like normal pre-teens do," Biel shared. "We were just chatting on the phone for hours. So, we never really kissed for a very long time."
Still, 34-year-old Biel knew right away that the "Suit & Tie" singer was the one.
"I have this email that is really funny that I sent to my producing partner, Michelle, actually, and it's literally, like, 'OK, I can't make that meeting so I have to cancel, also I know I will marry this man, you can't tell anybody but your husband.'"
"I have no idea why I wrote that email," she added. "I don't know what he did that day, but I have this hilarious email."
Of course, Biel's gut instinct turned out to be right. The couple have been married since October 2012, and welcomed their son, Silas, in April 2015.
And the pair definitely still knows how to have plenty of fun together, as evidenced by their super cute date nights. ET spoke with Biel at the premiere of her new film, The Book of Love, on Tuesday, where she talked about spending one-on-one time with her man.
"Honestly, we've had so many date nights we don't even know what to do with ourselves anymore!" Biel quipped. "We're like, 'All right, screw date night, this is too much!' We just need to hang out and sit on the couch for a second."
"I hope I'm inspiring to him," she said. "I think having a partner who is doing something that you're excited about -- like for me, his music and everything that he does -- it's just amazing to see somebody doing what they love, and I think it can be as simple as that."