Self-Portraitists50 Cent, Mario Lopez & More Celebrity Twitter Pictures (Photos)Kevin Hart’s very bad morning, Mario Lopez goes Gangnam Style, and more of week’s best tweeted snaps.Mike Munoz09.23.12 4:45 AM ETJoseph Gordon-Levitt prepares for Letterman, Mario Lopez goes Gangnam Style, and Kevin Hart has a very bad morning. Plus, more celebrity Twitter pictures from this week. Twitter / @hitRECordJoeJoseph Gordon-LevittThe actor posted this photo of himself looking sharp backstage at the Late Show with David Letterman. His next film, Looper, is set to hit theaters September 28th. Twitter / @MarioLopezExtraMario LopezTV personality Mario Lopez has been bitten by the Gangnam Style bug and posted this picture of himself with K-pop sensation, Psy. Lopez added “Fun flash mob today @TheGroveLA … Crazy, fun Monday..” Twitter / @KevinHart4realKevin Hart“Started my morning off by getting pulled over by the cops #FML,” wrote comedian Kevin Hart when he posted this photo. Hart has had a big year and recently hosted the 2012 VMAs, but he unfortunately ran into a bit of bad luck this morning. Twitter / @unfoRETTAbleRettaKnown for her role as “Donna Meagle” in the NBCs sitcom Parks and Recreation, Retta posted this photo of herself on set with costars Chris Pratt, Aubrey Plaza, and Rashida Jones. “We’re baa-aaack” she wrote. Twitter / @andersoncooperAnderson CooperNews anchor Anderson Cooper posted this photo from his set with guests Jon Cryer and Cyndi Lauper. Cryer’s sitcom Two and a Half Men returns for a new season September 27th and Lauper has been working on a new musical version of “Kinky Boots.” Twitter / @mrbradgoreskiBrad GoreskiFashion stylist Brad Goreski posted this photo of himself and Glee starlet Jenna Ushkowitz as he prepares her for the 64th annual Primetime Emmys. Twitter / @kathygriffinKathy GriffinComedian Kathy Griffin posted this picture of herself with Mad Men star Christina Hendricks and wrote “These 2 gingers could get into some real Emmy trouble.” Hendricks has been nominated for Best Supporting Actress in a Drama Series for her role as Joan Harris in Mad Men. Twitter / @JordinSparksJordin Sparks“At the docks yesterday in San Diego. Such a gorgeous day!” wrote American Idol winner Jordin Sparks when she posted this picture. Sparks recently starred in the musical drama Sparkle alongside Whitney Houston in her last performance before her death. Twitter / @50cent50 CentHip-hop juggernaut 50 Cent posted this picture with Filipino boxing champ Manny Pacquiao and wrote “Big business moves.” 50 Cent is known to be close to Pacquiao’s rival Floyd Mayweather Jr., but it appears the rapper has had a change of heart. Twitter / @SHAQShaq“My new Tru TV show #UPLOAD with my co-host @garyowencomedy @godfreycomedian” wrote basketball legend Shaquille O’Neal when he posted this photo. Shaq’s new show will feature him and his cohosts scouring the Internet for the funniest viral videos. Twitter / @jamieoliverJamie OliverCelebrity chef Jamie Oliver posted this photo of himself looking a bit overwhelmed with an armful of squash. “Look what I just cropped and im a gonna COOK !!! Yeah man who loves the squash !! @ squash time” he wrote. Twitter / @ricky_martinRicky Martin“Did u get the UNIDOS for @BarackObama shirt yet?” wrote Latin singer Ricky Martin when he posted this photo to his WhoSay account of himself rocking his new tee.