Self-PortraitistsRihanna, Kim Kardashian & More Celebrity Twitter Pictures (Photos)Anna Klassen04.29.12Self-PortraitistsRihanna, Kim Kardashian & More Celebrity Twitter Pictures (Photos)Tyra Banks hangs with Katie Couric, Snoop Dogg backstage, and more stars’ Twitter photos.Anna Klassen04.29.12 4:00 AM ETBrooklyn Decker takes a spill while hiking, Lauren Conrad’s bright new hair, and Holly Madison supporting her favorite cause. Plus, more celebrity Twitter pictures from this week. WhoSay.com / Tara BanksTyra BanksAmerica’s Next Top Model host Tyra Banks posted this photo of herself posing with Katie Couric at an event and wrote, “With the fierce @katiecouric, posing H2T at the #Matrix12!” In its 19th season, America’s Next Top Model is seeing decreased ratings, perhaps due to Banks’s firing of the show’s seasoned fashion experts—Nigel Barker, J. Alexander, and Jay Manuel. WhoSay.com / Brooklyn DeckerBrooklyn DeckerJust Go With It actress Brooklyn Decker tweeted this photo of herself taking a spill and wrote, “Caught air and slipped right on my butt.. Love that @carolinelovern first reaction was ‘grab the camera!’” The actress stars in Battleship, a Transformers-esque action flick out May 18. WhoSay.com / RihannaRihanna“You Da One” singer Rihanna tweeted this photo of herself and wrote, “Night Night LA......its been real!” Embarrassing her daughter, RiRi’s mother went public about her daughter’s fling with Ashton Kutcher. Rihanna responded by tweeting, “"2nt consisted of us singing Bob Marley, drinkin Vintage Scotch, and my mom thinkin a joke abt Kutcher was appropriate! #Thxtime100." WhoSay.com / Snoop DoggSnoop DoggPuff Puff Pass enthusiast Snoop Dogg tweeted this photo of himself and wrote, “Baccstage with Matt Barkley and Troy Polamalu #coachella.” Snoop Dogg performed at Coachella, along with a Tupac Shakur hologram. The singing and dancing image was so lifelike and received such an enthusiastic response, it may go on tour with the rapper in the future. WhoSay.com / Lady GagaLady GagaLady Gaga tweeted this photo of herself and wrote, “So happy! The Stage is more than I could dream for, time to kill the dance floor. Off to rehearsal.” Gaga will appear alongside fellow chart-topper Justin Bieber on the big screen in Men in Black III. The pair will make a cameo as aliens. WhoSay.com / David ArquetteDavid ArquetteActor David Arquette tweeted this photo of himself taking a joy ride and wrote, “Davey Goodtimes in Vegas! Yeehaw!!!” The Never Been Kissed actor recently admitted his crush on “Domino” singer Jessie J. The singer responded by saying, “The truth is it’s just me, myself and I. My music is what I’m in love with right now so David Arquette can fancy me all he likes but that’s what I’m about.” WhoSay.com / PinkPink“Sober” singer Pink tweeted this photo of herself and wrote, “Hahaha look at the relief on my face after @hartluck1 let me out of the truck!!!! Rock n roll baby!” The rocker recently praised fellow singer Adele, welcoming her to Time’s list of influential people, saying, “When I first heard Adele, I was on tour, alone in a hotel room in London, watching her sing from a rooftop on YouTube—a song called ‘Hometown Glory.’ I thought, ‘Who is this creature? This voice! Her tone!’” WhoSay.com / Kim KardashianKim KardashianKeeping Up With the Kardashians’ Kim tweeted this photo of herself and a toy giraffe and wrote, “Meet Shelli, Henry's baby sister!” As if made in pop-culture heaven, Kardashian has recently been linked to rapper Kanye West. The reality -V star even wore a pair of earrings with his initials, “K.W.” in public. WhoSay.com / Lauren ConradLauren ConradFormer Hills star Lauren Conrad tweeted this photo of herself sporting a new hairstyle and wrote, “My Little (pink) Pony!” She added the bold color to her locks for the final stop of her tour for her new book, The Fame Game. “I figure that I might as well have fun experimenting while I’m still young. And it’s only temporary so it’s really not that big of a commitment... Fashion is about having fun and taking chances. Plus the pink tipped pony added the perfect pop of color to my otherwise monochromatic look,” she said of the style. WhoSay.com / Kathy GriffinKathy GriffinFunnylady Kathy Griffin tweeted this photo of herself with fellow comedians and wrote, “It's very important to @conanobrien & @andy_richter that my hair is PERFECT 4 tonight.” Griffin’s latest endeavor, a talk show on BRAVO, brought in only 987K viewers its first week, beat out by The Real Housewives of Atlanta, which came in at a whopping 2.5 million. WhoSay.com / Holly MadisonHolly MadisonFormer Playboy playmate Holly Madison tweeted this photo of herself with a furry friend and wrote, “At the Animal Foundation today with another cutie up for adoption!!” The animal lover and star of Las Vegas’s Peep Show celebrated her third anniversary with the hit strip show earlier this month. WhoSay.com / Jordan SparksJordin SparksAmerican Idol winner Jordin Sparks tweeted this photo of herself and wrote, “Another look for today! Daaaaang look at those curves! Model walk in @reebok! lol :D” Sparks stars opposite the late Whitney Houston in Sparkle, which will include a duet the pair collaborated on. “I actually just heard a cut of it the other day and my jaw was on the floor,” the singer ++told Entertainment Weekly.