Justin Timberlake and Jessica Biel

Justin Timberlake guides his Boxers, Brennen and Buckley, on a hike through Runyon Canyon this morning, while his girlfriend Jessica Biel took control of her Pit Bull Tina's leash.

Fergie

Fergie took her two Daschunds for a walk in Brentwood this morning. She gained 13 lbs for a movie role in the film, Nine, but was told not to drop the weight just yet as they are re-shooting some of the finale in early December. Fergie is a workout fiend so she said she is trying to ease back into it as soon as she can.

Matthew McConaughey

Matthew McConaughey enjoys some downtime at the beach in Malibu with his mutt playing fetch.

Hayden Panettiere

Hayden Panettiere was a little red in the face when she was caught by photogs during her workout. The Heroes star took her pup for a job near her home but quickly covered up and headed back once she was spotted.

Rachel Bilson

Rachel Bilson and Thurman Murman go for a hike at Griffith Park this afternoon. Can't wait until Lula starts making some celeb friends. I think I'll have to train her to run over to the first dog she sees when I say "puparazzi'!

Ashley Tisdale

Ashley Tisdale arrived back in LAX after promoting HSM 3 in Rome. Looks like she took Blondie along for the trip!

Lauren Conrad

Lauren Conrad and her best buddy took her dog Chloe for a walk in Runyon Canyon over the weekend. Chloe sure got big!

DON's Delight

My most exciting news is that after YEARS of waiting, I finally adopted a rescue pup yesterday. Her photo is below and she needs a name, so I'm working on that. She about 10 months old and some kind of Spaniel mix. She was one of many dogs that are in the shelter as a result of foreclosures (people forced to leave their homes and unable or unwilling to bring their dog with them to their next location). But as you can see from her smile, she is a very happy girl and she seemed to get along well with Indy during her home visit. She is being held at doggie daycare until I return home. Expect lots more on her in the weeks to come!

Rachel and Hayden

Looks like Rachel Bilson and Hayden Christensen are still a couple. The pair were seen getting cozy on the set of a Lacoste commercial. Rachel hung on to her dog, Thurman Murmen, while her boyfriend strolled around in what looks like a leotard and harness.

Charlie Turns One!

Until I have a dog of my own, I just love enjoying the company of my friend's mutts. Here's Julie and Ryan's boy Charlie celebrating his first birthday in style.

Natalie Portman

The newly single Natalie Portman (she recently split with musician Devendra Banhart) prepares to take off from LAX with her best buddy, puppy Charlie.

Aubrey O'Day

Aubrey O'Day attended the Declare Yourself party last night with her puppy, Ginger, who looks like she wants to die. Impossibly, this is the classiest I've seen Aubrey look perhaps ever.

Leighton Meester

Leighton Meester walks her pooch on the set of Gossip Girl. Love her ensemble!

Blake Lively

Blake Lively shows up to the set of Gossip Girl with her tiny pooch in hand.

Nick Jonas

Nick Jonas gives the paparazzi the thumbs up as he spend his 16th birthday walking his new pup near his Toluca Lake home.

Michelle Williams & Matilda Ledger

Michelle Williams and Matilda Ledger take a pooch for a walk. I feel like Michelle is always dressed like she came off the prairie or like she's in a modern dance troop. This case is the latter.

Kirsten Dunst

Kirsten Dunst got cleaned up in time to spend some time walking her dog and eating out in West Hollywood yesterday. You can see her dog is as thrilled as we are in that second photo.

LC and Lo

Lauren Conrad and Lo Bosworth spent Labor Day treating their pooch Chloe to a hike near their home.

Blake Lively

Blake Lively spent her 21st birthday on the set of Gossip Girl. But she was in good company - her poodle came along for the workday.

Ali Larter

Ali Larter looks pretty close to perfection as she plays on the beach in Malibu with her two dogs on Sunday.

Lauren Conrad

Lauren Conrad dropped off Chloe, who has gotten so big!, to Petco for grooming on Friday. I heart her entire ensemble, right down to the dog!

Rebecca Gayheart and Eric Dane

My heroes! Eric Dane and his wife Rebecca Gayheart saw a little pooch on the mend from a surgery at an adoption event while shopping yesterday. Looks like he pulled at their heartstrings because they adopted him on the spot. Love them!

Miley Cyrus

Miley Cyrus spent the weekend hanging out in her hometown of Toluca Lake, California. On Saturday, she took her dog shopping for her 1st birthday. On Sunday, she rode bikes with her mom, sister Noah, and brother Braison to lunch at Paty's.

Rachel Bilson

Rachel Bilson and her little sister Hattie took her dog Thurman Murman for a walk before meeting up with their grandma in Studio City yesterday. Rachel seems to be one of the most attentive and responsible celebrity pet owners. Nice job!

Rihanna and Chris Brown

Rihanna has quite a gentleman on her hands. Not only did her boyfriend Chris Brown carry her toy poodle, he also carried her shopping bags as the two did some damage to their credit cards on Melrose yesterday.

Leighton Meester

Leighton Meester returned home to New York after her trip to Los Angeles for the Teen Choice Awards with her pooch in tow. She looked a little sleepy and not thrilled to be greeted by the photogs.

Rachel Bilson

Rachel Bilson looks a bit grungy as she walks her dog Thurman Murman in Los Angeles over the weekend.

Paris Hilton

Paris Hilton took her puppy Marilyn Monroe shopping at Diavolina on Robertson. Looks like she's got her arms full!