Jessica Simpson
The star's publicist snapped this pic mid-photo shoot and tweeted, ""Hey @JessicaSimpson nice new 'do for 2011." Aren't publicists the best?!
Miley Cyrus & Kelly Osbourne
Twitpics really don't get much cuter. "This is how im a bad I influence on Miley I force her to eat cupcakes so I don't feel so bad about eating one!" tweeted Kelly.
50 Cent & Chelsea
Just after Chelsea posted a snuggly pic (see next photo), Fiddy gets in on the action, too, tweeting: "Why people keep saying I got jungle fever. I ain't never even kissed a white women. Lol."
Chelsea Handler & 50 Cent
The are-they-or-aren't-they-dating duo fan the flames when the funnywoman posted this bedroom scene shot on her Twitter. "I don't know why anyone thinks I would ever date a rapper," she teased.
Krysten Ritter, Kate Bosworth & Rachel Bilson
Don't hate these BFF & Baby costars because they're beautiful. Hate them because they're beautiful in such an effortless, behind-the-scenes kind of way.
Keith Urban, Carrie Underwood & Brad Paisley
Nicole's hubby reveals a sneak peek of what's to come at the CMAs. Talk about a power trio!
Kim Kardashian
When Kim K tweeted this confession: "I've never been on the subway....1st time for everything! Let's go!", you know she had to fix that. "On the 6!!!" she later updated everyone. And that's probably the only time you'll see her riding the subway, we're guessing!
Victoria Beckham
Well, this is an interesting homemade project Posh Spice tweeted. "School project! We made this pilgrim doll. Amazing what you can do with a toilet paper roll!" A Justin Bieber pilgrim? Yes please, we'll take three of them!
Jennie Garth & Snoop Dogg
We're not exactly sure who, why or what brought these two together, but surely this makes for the most random celebrity pairing of all time.
David Beckham
Posh posted this pic of her hubby sporting a pair of shades from her new eyewear collection. Well, he is model material.
Jill Zarin
Purple power! The Real Housewives star shows her support for Spirit Day, a day marked to raise awareness about bullying in the LGBT community.
Monica
What better way to share the good news of your engagement to L.A. Laker Shannon Brown than to tweet a pic of the fabulous rock you received?
George Clooney
The do-gooding movie star traveled through Sudan with Ann Curry and a team to bring awareness to nation's presumed forthcoming civil war.
Courtney Love
Oops. After accidentally posting a nearly-naked photo of herself (allegedly meant for the eyes of a boyfriend), Love calls it quits with Twitter.
Ashton Kutcher & Demi Moore
What cheating rumors? The couple celebrate their fifth wedding anniversary under the covers and "enjoying a day lounging around watching 'Breaking Bad,' " the missus tweeted.
Kim Kardashian, Jennifer Lopez & Fergie
It's a hot-chick trifecta in Miami, where Kim tweeted: "At the Dolphins game with my glam girls @JLO and Fergie!"
Rihanna
The songstress tweeted this bikini and balloon shot in which she says she's enjoying being the "Only Girl in the World." Frankly, we are, too.
Jimmy Fallon
We've seen the Late Night host's Robert Pattinson impression, now it looks like he's getting Bieber'd. We can't wait for the hilarious video that's sure to follow!
Kim Kardashian
The Kardashian ladies know how to do Oktoberfest: beer, braids and boobs! "Cheers!" Kim K tweeted. But Kris didn't want to let the party stop. "My mom will not take off her drindle she is even doing interviews in it! Embarrassing!" Kim complained later.
Paris Hilton
Paris looked excited to announce, "Just landed in Tokyo with my BFF/Sis @NickyHilton." But it was all downhill from there, as Japanese officials detained the heiress and she eventually had to go home. She tweeted this farewell: "About to take off. Going home now. So dissappointed to miss my fans in Asia. I promise to come back soon. I love you all! Love Paris xoxo"
Ashley Greene
Hair stylist Ted Gibson tweeted this photo of the Twilight babe during fashion week. His accompanying "Wowza!!!!!" is right!
Sienna Miller
"Sienna! Roaarrr!" the actress recently tweeted. Either she's prepping for Halloween, her Twenty8Twelve runway show at London Fashion Week or a furry convention—take your pick.
Justin Bieber & Chelsea Handler
Cougar catfight! The VMAs host is sure to incur the wrath of Bieber nation by challenging cradle-robber Kim Kardashian with this tweet: "@kimkardashian watch your armenian back, girl."
Katy Perry
A closeup of Katy's Brand-ed nails confirms she really loves her fiancé. Like, a lot. She even tweeted this tribute to him: "To the 1 year anniversary of our love @ the 's @rustyrockets. You're here w/us in spirit :)"