“Communication, communication, communication,” Biel told People. “The ability to be really honest about how you’re feeling and what your needs are. Just be able to communicate really honestly with your partner.
“That’s worked for us so far,” she said. “I would never want to speak on anyone else’s relationship, but that’s what we do.”
The two met through mutual friends back in 2007 after Timberlake had split up from Cameron Diaz. The singer then called her out to ask her out – but she didn’t say yes straight away.
“I did it the old fashioned way — by telephone,” Timberlake said at a press conference in 2012. “That’s something I learned from both my stepdad and my grandfather — that there is a thing called chivalry and it doesn’t have to die with the birth of the internet.
“The way I see it, if you’re asking a girl out on a date, it’s only right to do it in a way that she can hear your voice. I had to be pretty persistent in order to get her to say yes. But I have a fair amount of tenacity and if I want something I stick to it. And in the end she agreed.”