Unlikely celebrity BFFs

<b>Cameron Diaz and Reese Witherspoon </b> Cam, Reese and Drew Barrymore recently enjoyed a girls getaway to Mexico in March. And while Cameron is still single and a party girl, Reese and Drew are settled down with husbands and kids, but that doesn't affect their friendship.  “They’re just as charismatic and fun as you would imagine,” Reese says of her two besties. “It’s nice to hang with Drew because we both just had babies, and we can support each other. And Cameron is such a funny, bright gal. She’s an incredibly sharp business-minded woman, but she disguises that side of herself. It’s her secret alter ego.” Check out which other stars have unlikely BFFs. For more pics of Cam and Reese, go to <a target="_blank" href="http://www.x17online.com">x17online.com.</a> (/X17online.com)

<b>Jessica Alba and Nicole Richie</b> The young moms and fashionistas vacationed together in St. Barts sans their kids. Imagine bumping into these two on the beach? For more pics of Jess and Nicole, go to <a target="_blank" href="http://www.x17online.com">x17online.com.</a> (X17online.com)

<b>Robert Pattinson and Vince Vaughn</b> Despite their 16-year age gap, Vince and Rob enjoyed a guy's night out in Hollywood at  Larchmont restaurant on April 5. For more pics of Rob and Vince, go to <a target="_blank" href="http://www.x17online.com">x17online.com.</a> (Maciel/X17online.com)

<b>Elizabeth Berkley and Amy Adams</b> The former "Saved by the Bell" star and her family spent some time shopping at The Grove with "The Fighter" star and her family on Nov. 7. Nothing like shopping to bring people together! Click through for some more surprising BFF's in Hollywood. For more pics of Amy and Elizabeth, go to <a target="_blank" href="http://www.x17online.com">x17online.com.</a> (X17online.com)

<b>Surprise Best Friends</b> Shanna Moakler is a former beauty queen and Janice Dickinson is a former super model, so good genes are definitely something they have in common. But what do you think their dinner chatter is about?  Here they are hamming it up for the cameras at Chateau Marmont on Aug. 7. For more pics of Shanna and Janice, go to <a target="_blank" href="http://www.x17online.com">x17online.com.</a> (X17online.com)

<b>Jennifer Lopez and Leah Remini</b> The "King of Queens" star and the "Idol" judge have been pals for a long time. But in April Leah posted this<a target="_blank" href="https://twitter.com/#!/LeahRemini/media/slideshow?url=pic.twitter.com%2F5KE2vBKH"> pic on Twitter</a> and joked, "Me and some girl I met, says she's a singer slash actress, whatever." The two were seen hanging out back stage at some of the "A.I." tapings in May as well. (Twitter)

<b>Kim Kardashian and Kelly Osbourne</b> Kim and Kelly couldn't be more different, but maybe they bonded over having their families taped for reality TV? Kim recently posted this <a target="_blank" href="http://instagr.am/p/KxkMZ5OS37/">pic with Instagram</a> and wrote, “Flashback Friday! Lovd this pic of me @robkardashian @misskellyo @kanyewest a few weeks ago in NYC.” (Instagram)  

<b>Gwen Stefani and Cameron Diaz</b> The No Doubt singer <a target="_blank" href="https://twitter.com/#!/gwenstefani/media/slideshow?url=pic.twitter.com%2FmnM0pRQX">posted this pic</a> where she's hanging out with her bandmate Tony Kanal, Cameron Diaz and another friend and called the pic "hot." (Twitter)

<b>Rihanna and Brooklyn Decker</b> It appears that the young stars became really close after filming the upcoming movie "Battlestar." Brooklyn even confided to GQ (jokingly of course) that her feelings for Rihanna run deeper than friendship.  "She could turn me gay - it wouldn't take that much effort!" says Brooklyn of Rihanna. "She's sexy. She just exudes confidence that's crazy intimidating I have to say, but she's very hot... Her sexuality can't be denied." (Reuters)

<b>Tyra Banks and Clay Aiken</b> Tyra Banks and Clay Aiken: Who knew that the former supermodel turned media mogul loved to hang out with BFF Aiken. The two have done appearances together and she even said she "is so in love with him" on her blog. Indeed. (AP)

<b>David Beckham and Snoop Dog</b> David Beckham and Snoog Dogg: The athlete and the rapper are reportedly quite close, with Becks appearing on Snoop's show and coaching his football team on the ways of soccer. (AP)

<b>Mariah Carey and Da Brat</b> Mariah Carey and Da Brat: The girl diva and the tough-talking rapper hardly seem like a match made in heaven, but are as close as can be, with Brat even being one of the handful of people at Carey's wedding to Nick Cannon. (AP)

<b>Paris Hilton and Kathy Griffin</b> Paris Hilton and Kathy Griffin: The May-Decemeber bffs caused a media frenzy when they shopped on Rodeo Drive and sun-bathed in bikinis together. (AP)

<b>Mel Gibson and Britney Spears</b> Mel Gibson and Britney Spears: Gibson and Spears bonded last year when he invited the pop princess to use his home in Costa Rica and offered her advice on life. Aww. (AP)

<b>Ron Howard and Jamie Foxx</b> The director and actor would certainly have their love of cinema to talk about, but fans were quite surprised to see Howard make a cameo in Foxx's glitzy hip hop video as one of his high profile celebrity pals. Yea, we never thought we'd see that either. (AP)

<b>Tom Cruise and Jada Pinkett</b> The action hero and the pint sized star have been friends for years and speak highly of each other at all times. (AP)

<b>Chris Martin and Jay-Z</b> The rocker and the rapper have collaborated professionally and are such good friends that their wives Gwyneth Paltrow and Beyonce are also BFFs. (AP)

<b>Victoria Beckham and Katie Holmes</b> While diva Victoria looks like a mismatch to quiet and reserved Katie, these two share a love of fashion and a life of fame. That's enough to build a lifetime of friendship in Hollywood. (AP)

<b>Ashton Kutcher and P. Diddy</b> While this duo hasn't been spotted together recently, for a while the funny man and hip hop mogul were photographed everywhere as a dynamic duo. Trouble in paradise? (AP)