Rachel Hunter with her dogs in front of their chic house. (La Petite Maison)When it comes to their pets, some celebrities spare no expense. Case in point: Supermodel Rachel Hunter's dogs reside in a house built especially for them that has terracotta floors and a red tile roof! In this episode of "Celebrity Pet Project," host Theo Von chats with interior designer Kari Whitman, who has created incredible living spaces tailored for dogs owned by Kristen Bell and Jessica Alba … including a doggie bunk bed in the Alba family's kitchen so the furry ones could watch their owner cook dinner!

Fiona walking Janet. (PacificCoastNews.com)Fiona Apple's 13-year-old pit bull Janet has been there for her through all the ups and downs over the years, and now the singer is returning the favor. On Tuesday, Apple announced via a four-page handwritten note posted on Facebook that she has postponed her South American tour indefinitely as she cares for her dog as it nears the end of its life after a two-year battle with cancer.

John O'Hurley talks to omg!. (WireImage)It's been 11 years since actor John O'Hurley began an unlikely new Thanksgiving tradition: Co-hosting a dog show on national television in front of tens of millions of viewers. And, the 58-year-old admits, he has the now-famous mockumentary "Best In Show" to thank for the gig. After an executive at NBC (the same network that aired "Seinfeld," in which O'Hurley starred as the over-the-top catalog mogul J. Peterman) watched the Christopher Guest film that satirizes the world of dog shows, he decided a real-life dog show would be the perfect fit to fill the post-parade slot in the Thanksgiving Day TV lineup. And O'Hurley would be the perfect person to co-host it.

"I looked at this and as strange as it was, I said, 'You know, for some reason I have to do this,'" he tells omg! of hosting what's now "The National Dog Show Presented by Purina." "It was just an odd opportunity and yet it's returned just so much joy to me over the 11 years I've been doing it."

Some of the biggest celebs in Hollywood are saving lives … of the four-legged variety. No longer is it popular to walk around with a pet shop-purchased pedigree dog by your side. These days, stars are heading to their local animal shelters to find their furry best friend. In the latest episode of "Celebrity Pet Project," one of pet adoption's biggest supporters, Mariel Hemingway, explains to host Theo Von how her mixed-breed cuties have changed her life. The actress is also featured in the new book, A Letter To My Dog, an ode to man's best friend that includes letters from owners including Oprah Winfrey and Hilary Duff.

Taylor Lautner poses with his furry fan. (Christopher Polk/Getty Images)One fan just couldn't be controlled at the world premiere of the final "Twilight" film. A black Labrador, who obviously sides with Team Jacob over Team Edward, broke down and planted a kiss on the side of Taylor Lautner's face as he walked the black carpet for the release of "The Twilight Saga: Breaking Dawn — Part 2" in L.A. on Monday. As reported by People, the dog was walking with a U.S. Marine and wearing a collar from the non-profit group America's VetDogs, which provides service dogs to disabled veterans and active service members.

Justin Bieber on his tour bus. (Guillermo Bosch/INFDaily.com)Since his relationship with Selena Gomez is reportedly in the off-again phase, Justin Bieber has been enjoying cuddle time with … his hamster.

In New York City for a stop on his Believe tour, the 18-year-old gave fans who had gathered outside of his tour bus a glimpse of his new furry friend, Pac, on Monday. First, the "Boyfriend" singer, who performed that night at the shiny new Barclay Center in Brooklyn, popped his head out of the bus — to the delight of a waiting mob of admirers. Bieber, who sported a hat with the word "dope" emblazoned across it, then disappeared for a moment and reemerged extending just his hand … which held little Pac. We imagine the squealing Beliebers gave Pac a warm reception!

Pac has become the official mascot of Bieber's tour, which extends into 2013. After buying his critter companion late last month, the teen heartthrob immediately introduced the little guy to the Twitterverse. "This is Pac the hamster, my new believe tour pet," he posted in late October.

Denise Richards and her new addition, Tara. (North Shore Animal League)

Denise Richards' crowded house is about to get even more crowded. The 41-year-old, who lives with her three daughters, her father, and a house full of dogs in Los Angeles, just added another four-legged friend to the family.

Over the weekend, Richards flew to the East Coast and visited Long Island's North Shore Animal League America to help promote the non-profit's animal rescue efforts in the wake of devastating Hurricane Sandy and encourage the public to adopt a pet.

The actress did such a good job, she even convinced herself, and ended up adopting an adorable little dog named Tara.

LeAnn Rimes (Getty Images)LeAnn Rimes has opened her heart — and home — to a traumatized little puppy.

The country singer was so moved when she read a friend's online post about a dog being thrown out of a moving car into traffic on a Los Angeles street that she immediately adopted the animal. Just hours after the pup's life was in peril, it was already adjusting to a life in Rimes' posh pad.