Matthew McConaughey
Matt's mutts BJ and Foxy are the best personal trainers ever.
Hayden Panettiere
Hayden enjoys a stroll on the beach with Harry Morton (not pictured) and his Rottie, Jesús. Guess the Heroes honey left her own pooches at home.
Sarah Michelle Gellar
Who needs a bodyguard when you have an Akita like Tyson?
Mariah Carey
Mariah's looking slinky in a snakeskin-print sheath while shooting her new video for "Obsessed," but her adorable pup Jack sorta steals her thunder.
Dierks Bentley
Not only was Jake Dierks' date to 2009 CMT Music Awards in Nashville, but he's appeared in a few of the singer's videos as well.
Chris Isaak
The handsome crooner takes Maltese Rodney everywhere. "He's traveled more than my entire family has up to this point," says Isaak.
Ellen Pompeo
Judging by how sweetly she's cradling her toy poodle Gigi, preggers Ellen is gonna make one great mama.
Hugh Jackman
While we appreciate the Oscar host giving man's best friend a lift, think he could be a little more gentle? It's a puppy, Wolverine—
not a prop.
Drew Barrymore
It's Take Your Pet to Work Day, as Drew brings her trusty lifesaver, Flossie, to the office. Women's best friend, indeed.
Zachary Quinto
Zach's found stardom as Sylar and Spock, but he credits his Irish wolfhound-Airedale terrier mix, Noah, with keeping him grounded.
Anne Hathaway
The actress and her chocolate Lab, Esmerelda, enjoy some girls' time with a stroll around NYC's West Village
Michelle & Malia Obama
While we were hoping for a rescue dog, we can't deny that first puppy Bo is just adorable. Congrats to the Obama family!
Blake Lively
Blake brings her lovely pup Penny to the Gossip Girl set, sparking rumors that Ewoks do exist.
Ed Westwick & Jessica Szohr
Ed may be trying to channel Marlon Brando in The Wild One with his oh-so-cool getup, but toting along Jess' sweet little Lhasa Apso, Watson, kinda ruins it.
Gisele Bündchen
Wonder if the adorable duo of Gisele and her dog overloaded LAX security's cuteness detectors?
Selena Gomez
Waverly Wizard Selena—owner of four pups, Willy, Fina, Wallace and Chip—makes it a magical day for the strays of Puerto Rico and brings awareness to the issue of pet abandonment.
Katherine Heigl
Miniature schnauzer Romeo is just one of five pups in Katherine and hubby Josh Kelley's pack.
Nick Jonas
Much like his musical namesake, Nick's golden retriever Elvis is a hunka, hunka puppy love.
Mickey Rourke
Mickey's beloved Chihuahua Loki passed away this year at the ripe ol' age of 18 after safely ushering her pack leader back into the limelight.
Carmen Electra
Apparently, a dog's life isn't such a bad thing.
Miley Cyrus
We're guessing maltipoo Sophie was Miley's bolt of inspiration for her Oscar-nominated song, "I Thought I Lost You."
AnnaLynne McCord
No offense, AnnaLynne, but we're kinda torn on who's cuter.
Justin Timberlake & Jessica Biel
Justin and his boxers, Buckley and Brennen, and Jess and her pit bull, Tina, make for one awesome blended family.
Jennifer Aniston
Guys may come and go, but Jen knows her best friend Norman will always be there for her.