Some of Tinseltown's biggest stars were in full Easter bloom on Sunday, sharing their most adorable holiday pics on Twitter.

Credit: (Twitter)

"California Gurls" Katy Perry showed that she wasn't worrying about her breakup with John Mayer one bit! The newly single star spent the day with her adorable niece Kai, showing off their precious moment on Twitter, writing, "Happy Easter from Kai & Katy! (and a silly rabbit)." We don't know who's cuter, the bunny or the baby!

It's no surprise that "American Idol" diva Mariah Carey shared her day via social media, tweeting a goofy pic of herself and hubby Nick Cannon saying, "Happy Easter Dahhlings...I finally caught the Easter Bunny."

But they weren't the only ones to get in on the eggscellent holiday Twitter trend. Britney Spears tweeted a pic of her precious puppy in costume, saying "Happy Easter! Blessed to be spending the day with my family back home(...missing my little @hannahspears though, she doesn't like to fly)."

Check out the video to find out what other celebs traded their cocktail dresses for cotton tails and bunny ears!

Justin Bieber.Lindsay Lohan. (Splash News)April isn't the only month for fools in Hollywood … some act like that 365 days a year.

It was tough to pick just a few to celebrate April Fools' Day, but we narrowed it down to those who have been grabbing headlines for all the wrong reasons these first three months of 2013.

Cory Monteith and girlfriend Lea Michele (Getty Images)“Glee” actor Cory Monteith has checked into rehab for substance abuse. The 30-year-old “has voluntarily admitted himself into a treatment facility for substance addiction. He graciously asks for your respect and privacy as he takes the necessary steps towards recovery,” his rep tells omg!.

Debra Messing dishes to omg! on her new show. (Startraksphoto)Debra Messing is ready for a fresh start.

The Emmy-winning actress has just signed on to star in a new CBS sitcom pilot and recently completed a cross-country move.

After NBC announced this month that Messing's musical drama "Smash" is moving to Saturday nights — a terrible sign for the future of the low-rated show — Messing agreed to take the lead in the untiled project. (She quickly shot down reports that she was leaving "Smash," but admitted to fans via Twitter that the timeslot move "doesn't bode well.")

During a chat with omg!, the 44-year-old elaborated on what led her to accept the role of Shira, a married mom who struggles to have it all.

Jim Carrey (Gary MIller/FilmMagic)Jim Carrey isn’t about to let Fox News have the last word.

The 51-year-old put out a statement on Friday alleging that the cable news channel had “viciously” slandered him via its coverage of the Funny or Die video he released earlier this week, titled “Cold Dead Hand,” that pokes fun at the late former NRA president Charlton Heston and gun enthusiasts.

In the statement, the “Liar, Liar” actor continually refers to the network as “Fux News” and says he would “take them to task legally if I felt they were worth my time or that anyone with a brain in their head could actually for fall for such irresponsible buffoonery.”

Spring is in the air, and so is a little bare (midriff) skin! Mischa Barton and Audrina Patridge are the latest Hollywood starlets to sport the sexy style. The brunette beauties stepped out Thursday night for the Fire & Ice Gala in Hollywood, rocking white cutoff tops and matching skirts. This belly-baring trend is something we've been seeing all over the red carpet recently.

Last weekend, Katy Perry wowed at the Kids' Choice Awards 2013 in a colorful bralet and body-con skirt. She certainly was showing John Mayer what he's missing! And former Disney darlings Selena Gomez and Vanessa Hudgens have also rocked the look this month while promoting their new flick, "Spring Breakers."

This sultry style seems to be a big hit for spring! So, which star tops your best-dressed list? Join the conversation on Facebook and Twitter, use #omginsider, and 'remember to tune into "omg! Insider" tonight on TV.

Carmen strikes a pose. (Twitter)Leave it to Carmen Electra to turn getting pulled over into a sexy photo shoot.

On Friday morning, after taping "Access Hollywood," the former "Baywatch" star tweeted that she "got pulled over for slightly speeding and this happened …" along with a black-and-white photo of her posing next to a LAPD motorcycle.

TumblrIreland Baldwin recently announced she’s signed a modeling contract, but in case anyone missed the news, she’s now proving it through photos.

Alec Baldwin and Kim Basinger’s 17-year-old daughter has taken to multiple branches of social media this month to show off her 6’2” fab figure. On Instagram there’s a selfie of the teen standing in her bathroom, donning just a cleavage-baring Nike sports bra and super-short spandex shorts. On Twitter, she’s got a shot of herself standing in her kitchen downing Cheerios while wearing nothing but (a different) sports bra on top. And just this week on her Tumblr account, Baldwin flaunted her toned bod in a super-sexy shot, standing at the ocean’s edge with wet hair in a skimpy bikini.