Now, Simpson has moved into a $5 million home in Beverly Hills. She's filming her second movie, "Employee of the Month," working on another album, and is endorsing lines of makeup, clothing and shoes.
Lachey is in Bel Air, where he's developing a TV sitcom for the WB, starring as a newlywed baseball player. He's been denying rumors that he's been dating Simpson's friend and former assistant, Cacee Cobb, and has also been romantically linked to Lizzie Arnold, the former Miss Kentucky.
While a reunion with 98 Degrees is always a possibility, the music world seems to have said "Bye, Bye, Bye" to boy band pop. Lachey's plan is to get his solo career on track. "Finishing my album is the priority," he says in the upcoming issue of Cargo magazine.
"It's more rock and guitar-driven, which has allowed me to change my vocal sound a bit. It's not a crazy departure. It's not going to sound like AC/DC, with everyone like, 'What the hell is that?' It's definitely still me, but I've tried to push myself."
Lachey's also trying to make it as a TV pitchman. He'll soon be seen shirtless in an infomercial for celebrity personal trainer Gunnar Peterson, who is marketing a series of workout DVDs -- a project that netted him $500,000.
But even in the throes of divorce, Lachey is still searching for domestic bliss. On TV, he could indeed be seen as a family man, hugging his pregnant sister-in-law, Lea, as they cheered on the sidelines for the future dance champ.
But even his brother's union reflects upon his own choices. Drew and Lea met in the fifth grade, and she served as a choreographer for 98 Degrees. And while their union has withstood the challenge of working together, Nick's clearly hasn't.
Still, to his credit, he tries to keep up a brave face.
"Obviously, it's not the right time for me to be a father," Lachey tells Teen People. "But the one thing I haven't had a chance to do is be a great dad."
"Playing with my friends' kids and having them call me Uncle Nick -- that's life."