There are so many fabulously fit celebrities out there that it's hard to keep track of who is doing what. We give you the scoop here at That's Fit all week long, but in case you missed anything, we've got it all wrapped up, too. There's practically a bow on for you!

Click on your favorite celebs above to find out what they're up to, and use that motivation to get yourself in shape!

Randy Jackson calls his diagnosis with Type II diabetes a double-edged sword. It was bad, because diabetes is a disease that never goes away. But it was good, because he had to do something about it. What did he do? He lost weight -- and lots of it -- and changed his entire lifestyle. He dishes up the skinny in his new book Body With Soul: Slash Sugar, Cut Cholesterol, and Get a Jump on Your Best Health Ever.

While Jackson was the recipient of gastric bypass surgery, he says it wasn't meant to be an easy fix. A lot of hard work is still necessary after this expensive and risky procedure (just ask Karla), which certainly is not for everyone. It worked for Jackson, though, since he had a disease and needed to do something quickly.

Post-surgery, Jackson is all about changing habits, and he fully endorses the morsel diet -- just have a bite and then move on. And no seconds either. Hey, we all know what's good and bad for us, says the American Idol judge. Eat healthy food and move. Does it get any easier than that?

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If you're an American Idol fan, then you probably took notice of judge Randy Jackson's dramatic weight loss a while back. But what you may not realize is that the celebrity lost those 110 pounds because of an alarming diagnosis: type 2 diabetes. Nearly 1/3 of people who have type 2 diabetes don't even realize they have it, and Jackson has teamed up with the American Heart Association to raise awareness. In addition to spreading the word about the disease, Jackson also wants everyone to know the heart risks associated with diabetes. Though many people think of kidney and eye problems when they think of diabetes, heart disease is actually a bigger problem.

To learn more, visit the campaign's website The Heart of Diabetes. If you or someone close to you has diabetes, you can also submit your story for a chance to be on a televised public service announcement with Jackson.

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Remember American Idol winner Ruben Studdard? I do -- barely. He's made the news again recently with reports that he's lost over 100 pounds, all with help from mentor and American Idol judge Randy Jackson.

Ruben is a good ole' southern boy, hailing from Alabama, where deep fried southern comfort food is a staple for many. As such, he is encouraging other Alabamans to Abandon their unhealthy habits and adopt new, healthy ones, as he did. Incidentally, Alabama has the distinction of having one of the highest obesity rates in the country - 28.4. Yikes!

I say good for Ruben for using his fame to influence others to be healthier. I hope he keeps up with his new habits and makes a difference in Alabama and nation-wide.

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