Helen Mirren showed the world that sex appeal doesn't end at a certain age. When photos popped up of her in a bikini, the internet went into a frenzy -- who knew 63 could look so good?

Speaking of bodies that look great in a bikini, Anna Kournikova seems to added some of her signature curves back to her figure. When she took part in a triathlon earlier this year, many spoke up about how tiny and thin she looked, but in recent photos, her body is more like what we've come to expect, and she looks gorgeous.

Anna isn't the only celeb who's trained for a triathlon -- Jennifer Lopez is training for a triathlon, to take place this October. The workouts are helping her lose the weight she put on when carrying her twins, and she's already looking slender.

A few months ago, Anna Kournikova participated in part of a triathlon, and there was a lot of press about her body. Well, okay, so there's always a lot of press about Anna's body, but this time, it was about the distinct lack of curves -- she looked leaner than we were used to seeing her, though I maintain that she still looked healthy and athletic.

Now, her body is once again (still?) making headlines, this time because she seems to have regained the curves that made her so famous. Come on, you know she didn't become this well-known through tennis alone!

She's spoken to the media several times regarding weight loss, and has always insisted that it fluctuates with her training. And, the thing is, a lot of the difference in her physique seems to have something to do with the bra she's wearing -- a sports bra can keep lots of women from looking their curviest.

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Anna Kournikova participated in the Nautica South Beach Triathlon. Sort of, anyway. She ran a four mile portion as part of a relay team for K-Swiss. She held a very respectable 7:15/mile pace, but she had another goal that took up a good bit of her focus -- raising awareness for St. Jude's Children's Research Hospital. The tennis player regularly incorporates running into her fitness routine, so this was not a huge stretch for her. Some observers say she's lost her curves, but I think she looks fit and healthy.

Mariah Carey is showing up everywhere lately, but there's less of her to see thanks to a lifestyle change and nutrition and fitness coach. She admits she's bummed to give up her comfort foods, like mac 'n cheese, but she's thrilled to be fitting into the same size jeans she wore in 10th grade.

Not only is Britney Spears working out at Bally (she's been there one to three times a day, lately) -- she just might become their newest spokeswoman. You know, if fitness plays a big role in Britney turning her life around, then Bally might be taking a really smart risk. Or not. Only time will tell.

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I love to sweat. So does Anna Kournikova.

"I feel great when I sweat and get all the negative energy out," says the tennis pro who spends much of her workout time using weights and machines so she can maintain her muscle mass. She doesn't devote much time to cardio but does do a little so she can relieve stress and sweat.

On the internet speculation about her weight loss, Kournikova says: "You know that you're a public person. You know what you're getting yourself into and you just have to be okay with yourself. It's just somebody's opinion and you just can't focus on that."

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