Photo: Getty Images.Joshua Jackson and Diane Kruger seem like one of the sweetest, most in-love couples on the planet. Even in the rocky Hollywood universe, they've managed to keep it going since 2006. So, when we caught up with Jackson at McDonald's FIFA World Cup Kickoff event on Thursday, we had to pick his brain for relationship advice. When it comes to a happy, healthy partnership, what's the trick? "Liking each other. That’s important," he jokes. Just toy with our hearts, why don't you? Adopting a more serious tone, he got to the meat of things. "The key to making it work is to work, it turns out. It’s boring, but you’ve got to work. Hard. It’s got to be important to you all the time.” Well said, Pacey. Well said.