Odd Couples: Celebrity Romantic Mismatches of 2012

The most surprising hookups and makeups of the year.

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Jennifer Lopez and Casper Smart - The mating habits of celebrities never fail to leave us scratching our heads, and 2012 showed no shortage of odd couples. Topping our list are Jennifer Lopez and Casper Smart. When this duo got together in late 2011, mere months after Lopez's split from Marc Anthony, we thought it wouldn't last. But the mismatched couple made it to their first anniversary in 2012, longer than some of Lopez's marriages! (Photo: PacificCoastNews.com)

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Shar Jackson and Jason Alexander - Getting dumped makes for strange bedfellows. Years after Alexander's short-lived marriage to Britney Spears ended in annulment and Jackson's baby daddy Kevin Federline left her for the blonde pop star, the two jilted hearts got together for some TLC...and, if rumors are true, a little nooky-nooky. (Photo: WENN)

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Rita Ora and Rob Kardashian - Not to be outdone by his high-wattage sister, Rob Kardashian made himself a part of a power couple this year when he started dating Roc Nation's newest ingenue. In December 2012, Rob claimed Rita cheated and the short-lived romance ended.   (Photo: Rita Ora via Twitter)

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Rocsi Diaz and Eddie Murphy - Though they never made it "official," a string of coffee dates, a Hawaiian vacation and showing up arm-in-arm to the BET Awards told us all we needed to know about this odd couple's relationship status. Unfortunately, it was over before it really began for the former 106 & Park host and the legendary comedian. Murphy is now dating Aussie model Paige Butcher. (Photo: Zeus/Apollo/FameFlynetpictures)

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Ashton Kutcher and Rihanna - When two suddenly single people as hot as Ashton and Rih Rih bump into each other, a hook-up seems inevitable. The sexy pop idol was allegedly spotted doing the walk of shame outside of Kutcher's home early in the morning last March, prompting rumors and uncomfortable questions from the press. (Photos from left:  Jason Merritt/Getty Images, Dave Hogan/Getty Images)

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Deion Sanders and Tracey Edmonds - The couple that works together stays together? The NFL star and Hollywood producer certainly hope so. Sanders and Edmonds went public with their relationship this year, even as Sanders is going through a messy divorce from ex-wife Pilar. The kicker? Edmonds is producing a reality show about her boo's crazy post-divorce life.  (Photo:  Fernando Leon/Getty Images)

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Isabeli Fontana and Rohan Marley - His relationship with Lauryn Hill had reportedly been on the rocks for over a year, but Rohan left no doubt when he put a ring on his Brazilian model girlfriend. The pair postponed their wedding, reportedly because the couple's children from their previous relationships had not yet met. With Hill's recent tax trouble and impending sentencing, we doubt a family reunion is in the cards anytime soon. (Photo: RevolutionPix / PacificCoastNews.com)

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Lady Gaga and Taylor Kinney - It can't be easy to be Mother Monster's main man, but the Chicago Fire star seems to be enjoying the wild ride. After months of dating, the actor finally went public with his feelings about the pop icon, telling reporters he is a "happy, lucky guy." Wonder when they'll be having their own little monsters? (Photo: Interscope)

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Nene Leakes and Gregg Leakes - Our favorite couple from the Real Housewives of Atlanta are divorced but oddly dating. NeNe and Greg look very much in love on the latest season. Perhaps they'll remarry soon!(Photo: FameFlynet, Inc)

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Christina Aguilera and Matt Rutledge - For a while, it seemed like Aguilera had won the battle of the blonde pop tarts, recognized for her enduring talent and her stable home life with husband Jordan Bratman and baby Max. However, she up and left her white picket fence life and took up with a production assistant many years younger. If J.Lo can do it, why can't Xtina?  (Photo: Jason LaVeris/FilmMagic)