12/13/2007 at 09:00 AM EST
It's a tough boat to be in, but Britney
, and Nick and Jessica have all been there – watching their exes move on, which may be the toughest part of a breakup, PEOPLE reports in its latest cover story.
For instance, in the two years since Jessica Simpson
, 27, and Nick Lachey
, 34, called it quits, he has settled down with Vanessa Minnillo
, 27. Simpson, meanwhile, continues her quest for Mr. Right and is currently seeing Dallas Cowboys QB Tony Romo, 27 – whom she met through her dad.
"Jessica respects Nick and is happy for him if he's happy," says a Simpson source. For her part, "she wants to take her time and find the right person." Still, says a pal, "she misses having a serious relationship." (No pressure, Tony!)
As for Nick and Vanessa: "They have a very good time together," says another source. "They'll be the first to rave about each other's hotness!"
(For more on this story, including Reese Witherspoon's meal with Jake Gyllenhaal – and her kids – and single mom Bridget Moynahan's amicable relationship with ex Tom Brady, pick up this week's PEOPLE, on newsstands Friday