Actress Jennifer Aniston has been seen in some bikini’s lately and she is looking pretty good. She has been shooting scenes for her upcoming film "Just Go with It" in the beautiful location of  Hawaii. Shooting near a tropical waterfall, the 41-year-old actress wore a barely-there, hot-pink bikini. Her well toned body, which girls half her age would be jealous of, is not by chance, but something Aniston has worked to achieve. "She’s obsessed with staying fit and young," a source says in the latest Us Weekly.

Also driving Jennifer Aniston to have such a well toned, and beautiful body, is her "Just Go with It" co-star, who happens to be the SI model Brooklyn Decker. "Jen’s intimidated," the source says of Decker. "She’s very conscious of her body." In order to keep her bikini body the way it is, Jennifer Aniston spends at least an hour (sometimes more) daily at the gym at the Four Seasons in Maui — sweating it out on the treadmill and elliptical. I saw her on the treadmill, and it was angled all the way up," one Four Seasons guest recalls. "I couldn’t do that for one minute!" Keep at it Jen, your looking great!

Singer/entertainer Katy Perry has recieved the title of the hottest woman alive for 2010 from Maxim Magazine. Katy Perry tops the list of Maxim’s Hot 100. Perry was given the title on the grounds of her sexiness and talent. Maxim further defends its choice by saying, "Katys the best friend you suddenly realize you’ve loved your whole life." Maxim then adds, "The rad chick who taught you how to skateboard and whistle and also looks unbelievable in a bikini."

Some other female celebs who headlined the top ten of Maxim Magazine’s list include Brooklyn Decker, Zoe Saldana, Blake Lively, Megan Fox, Rihanna, Elisabetta Canalis, Olivia Munn, Kim Kardashian and Marisa Miller. Last year’s number 1 hottie, Olivia Wilde has fallen all the way down to the 20th spot on the list.

Make sure you grab a copy of Glamour in June, because Victoria’s Secret Model Alessandra Ambrosio, Sports Illustrated Cover Girl Brooklyn Decker, and Crystal Renn will be on the cover, and looking good! The three posed on a beach in St. Barths for photographer Matthias Vriens-McGrath. This is the first time that Brooklyn Decker and Crystal Renn will ever be on the cover, and this is also the first time since May of 2006 that a model will be on the cover. Alessandra Ambrosio was the last model to be on the cover.

The June issue of Glamour is sure to be a hit with Alessandra Ambrosio, Brooklyn Decker, and Crystal Renn on the cover. Check out some of the pics below to get a taste of what is to come.