Kim Kardashian's 4-month-old kitten Mercy, who was a gift from boyfriend Kanye West, has been put down, the reality starlet confirmed on her blog.

After learning that she was allergic to the cat, Kim gave her to sister Khloe's assistant Sydney Hitchcock in September. When the teacup Persian came down with symptoms of a "cancer-like virus often associated with breeding," Sydney decided to have her euthanized.

"My heart is completely broken," Kim wrote. "I had fallen SO in love with Mercy that I wanted to try everything I could to keep her but I didn't think it was safe to resort to injections, and it wasn't fair on Mercy, because I couldn't play with her or give her as much attention as I wanted to. Mercy deserved a mom who could really give her the time and affection she deserved. I knew that Sydney, Khloé's assistant, who had recently lost a cat she had loved and cared for for 17 years, would be the perfect mom for Mercy and Sydney was so excited to have Mercy as her own!"

"They discovered she had a stomach problem that we weren't aware of," Kim continued. "Poor little Mercy died the very next day. It broke not only my heart that little Mercy died at only four months old, but Sydney's too. Mercy was a gentle and loving kitten and we are all going to miss her so much. Thanks to Sydney for making Mercy's short life one filled with love. RIP Mercy Xo."

Make that a Mickey Mouse muscle tee with a serious twist!

Justin Theroux hit the gym in West Hollywood on Friday, and the 41-year-old writer/actor gave us a peek at what Jennifer Aniston gets to see everyday when we snapped him leaving.

Oh, and get this ... Justin was drinking Smartwater! Jen probably has a lifetime supply at their house, so why not?

Brooke Mueller was hospitalized this afternoon after an assistant found her napping and unresponsive. Brooke's rep tells X17online.com:

"An assistant thought Brooke was non-responsive while she was napping and hastily called an ambulance. As a precaution, Brooke was brought to a local hospital and discharged after an hour. She was diagnosed with exhaustion and dehydration and is now fine and resting at home. That's it."

Mueller, Charlie Sheen's ex-wife, has been in rehab numerous times and most recently completed an in-patient treatment program in April. Mueller married Sheen in May 2008 and gave birth to twin boys Max and Bob in 2009. The couple divorced in May, 2011.

X17online caught up with Brooke last night at Mr. Chow, as she was on a date with her new boyfriend, jewelry designer to the stars, Pascal Mouawad.

What cute purple spectacles!

Jennifer Garner is back in Brentwood after spending time in New Orleans shooting her latest film Dallas Buyer's Club, and the first order of business was getting her caffeine fix at the local coffee shop!

The actress' daughter came along on the errand, and sported some adorable glasses! We know her older sister Violet wears them, but we had no idea Seraphina also had vision problems!

The Valentine's Day star must be glad to be home and reunited with her hot hubby Ben Affleck! And the Argo actor must be just as glad, because he's been on nonstop daddy duty since his wife skipped town!

Matt Damon and his gorgeous wife Luciana left their kids at home for a sexy night out at the Promised Land premiere held at the Directors Guild of America.

In the flick, Damon plays a salesman for a natural gas company whose life changes after arriving in a small town.

The sexy hunk stars opposite Frances McDormand in the Gus Van Sant-directed film.

Someone's got a brand new man!

Brooke Mueller dined at Mr. Chows in Beverly Hills last night, and delighted in showing off her new boyfriend Pascal Mouawad on the way out!

Charlie Sheen's ex and the famed jewelry designer look so happy together, and we couldn't be more thrilled that Brooke has finally achieved health and happiness!

A source tells X17online exclusively:

"Brooke and Pascal are dating. It's relatively new, but they are enjoying their time together. She really likes him."

The super wealthy jeweler really knows how to woo the ladies! He was last linked to Playboy pinup Jenny McCarthy in October of this year, so clearly he's got a charm women can't resist!

Paris Hilton and beau River Viiperi were inseparable while attending a barbecue on Miami Beach.

The sexy twosome shared a passionate kiss while taking a stroll. We're lovin' Princess P's flowy dress.

These two seem to be living life to the fullest!

At least she's finally admitting she doesn't have the greatest track record!

Speaking to the British edition of Cosmopolitan magazine, the singer admits she's quick to fall in love, but not the best at making that love go the distance.

Asked what she doesn't know about relationships, the Grammy winner confesses,"How to make them last. I've never had a really long relationship, so I have no idea what that's like. Wish me luck for the future!"

The country cutie has pursued quite a variety of different dudes in her day, and she is the first to agree that she doesn't really have a "type" that she typically goes for.

"I really don't have any rules about dating when it comes to height, age, career choice, anything like that. It doesn't matter. It's really more about strength of character. When it comes to age I've been all over the map!" she adds.

We're sure her new One Direction boyfriend Harry Styles is happy about that, considering he's four years her junior!