But the Sexy Back star couldn't resist gushing about his fiancee during a recent media conference with the Hollywood Foreign Press.
"She's a really, really, really special person," the singer-and-actor said about his lady love. "Plus, she's really, really, hot!"
And JT opened up about how he managed to persuade the A-Team actress to go on a date with him – and he took it old school to land the sexy starlet.
"There was nothing starry about the way we got together," he explained. "It was very un-Hollywood-esque in fact."
"We met and got talking. Afterwards I asked my friend if I could call her and ask her out. My friend called Jessica and Jessica said yes, and so I called her.
"I did it the old fashioned way – by telephone. 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."
Jessica, who previously dated The Avengers star Chris Evans, said "yes" when Justin proposed to her in Jackson, Wyoming, last December. And now JT has conceded who the boss is in their relationship.
"I answer to a higher power now," he laughed. "We have a couple of rules in our relationship. The first rule is that I make her feel like she's getting everything. The second rule is that I actually do let her have her way in everything. And, so far, it's working."
With this being a first-time marriage for the both of them, the Social Network star has turned to family members in how best to get and sustain a good union.
"I think it's important to remember that you go into something like marriage knowing that you don't know very much about it at all," he said. "But I do look at the marriage of my mother and stepdad, and what makes it work for them is that it's a team effort.
"Some days are better than other days for all of us – and if we have our good days and bad days individually, and then we're dealing with someone else's good and bad days on top of that, it's going to add up.
"My mother is a ball of fire in the world and I love that about her. But what I have learned from my stepdad is something as important, which is patience and compassion. Because when you are living with someone else, those two qualities go a long way."
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