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From chubby to hubba hubba! Who knew Hilary Duff's estranged husband Mike Comrie was so sexy?! Maybe this is why the couple have seemingly rekindled their romance?

Hilary and Mike took their son Luca to a mommy and me class (yup, the same one as Kim and Kanye), and we can't believe how much the former hockey pro has slimmed down over the last few weeks. Mike has been working out with superstar trainer Harley Pasternak, and we're not sure what motivated him to get his butt in gear, but we're guessing Hil isn't complaining about it! But what exactly is the status of their relationship?

In January the couple announced that they were separating after three years of marriage, but they've been spending an awful lot of time together lately. Not only that, but Hil's sister Haylie recently revealed to Us Weekly that Mike is "still so much a part of our family," and that the couple are "doing great … they're just taking their time. And they're young -- so they're not, like, putting stress to figure out which way it's going to go."

Sounds like they're keeping the door open!