"Don't listen to all the BS. Especially in his situation, he and his fiance [Jessica Biel] -- I haven't really talked to him about everything yet -- but they're both in the limelight as well," Fatone, 35, tells Parade. "It's tough for those celebrity couples. It's really hard. My wife wasn't in the limelight, which made it easier."
Fatone, who now hosts a culinary travel show called My Family Recipe Rocks on the Live Well Network, adds that "the key is to keep it happy, light, and fun."
"There can be a lot of drama, like when you have kids. And both of them have jobs where they are taken to different places," Fatone says. "It's the communication that really needs to drive that relationship."
Timberlake, 31, and Biel, 30, got engaged during a snowboarding trip in the Jackson, Wyoming mountains in December 2011. Sources tell Us Weekly they plan to marry next summer, and Fatone has already chosen a wedding gift: "A smack in the head!"