Blake Lively

Blake Lively and her Toy Poodle, Penny, grab a cab in New York with her on-screen and off-screen boyfriend, Penn Badgley.

Ashley Tisdale

Ashley Tisdale cut short a vacation with her mom and Grandma to Santa Barbara over the weekend due to bad weather. She spent Monday running errands and grabbing some coffee to go.

Natalie Portman

Natalie Portman and her own version of Justin Bobby, boyfriend Devendra Banhart, take a walk with her pup. Nat is in France as a juror for the Cannes International Film Festival.

Adam Brody

Adam Brody walks his dogs in Runyon Canyon over the weekend. Since the end of O.C. and his split from Rachel Bilson, Adam has kept an extremely low profile. But he always makes time for his pooches!

Jessica Biel

Jessica Biel walks her Pit Bull through an LAX terminal last night as she prepares to travel. She also brought along her bodyguard and personal assistant (who was carrying the bags).

Sophie Monk

Sophie Monk took her new boyfriend, video game director Jason Rubin's, dog for a walk yesterday after dropping him off at LAX.

Kristen Bell and Dax Shepard

Kristen Bell and Dax Shepard took her pup to a Los Angeles dog park. The couple have been dating just a few months, but seem to find plenty of time to spend together.

Usher

Usher seems pleased with his schnauzer as he gets him to sit nicely during a walk in Beverly Hills.

Lauren Conrad

Lauren Conrad takes her puppy Chloe for a check-up at the vet.

Jessica Biel

Jessica Biel takes her Pit Bull for a walk in Brentwood this morning. How cute is her outfit? And she's back to brunette again. I'm sure she's happy to be home again after filming away from her pup in London.

Gisele Bundchen

Gisele brings her Yorkie to work with her as she heads into a meeting with a photographer in New York City.

Rachel Bilson

Back from promoting Jumper around the world, Rachel Bilson spends time with her furry friend, Thurmen Murman, at a Los Angeles dog park.

Lauren Conrad

From Lauren Conrad's myspace:

"Last weekend Lo, Audrina and I moved into our new house. We love it!

On Monday, I got a puppy from the pound. She is the cutest puppy ever! Her name is Chloe. She is a lab/shepherd mix. I'm not getting much sleep because she thinks night time is play time. Ashes (my cat) is not thrilled with her, but I think they will become friends. I will post some pictures of her so you all can meet her.

Have a great weekend!"

Yay LC! Way to adopt!

Sandra Bullock

Sandra Bullock strolls downtown in New York with armfuls of dogs. She and her husband, Jesse James, are avid rescuers of dogs with issues. Yay Sandra!

Jessica Simpson

Jessica Simpson does some apartment hunting with her puppy, Daisy, in New York.

Eva Longoria

Eva Longoria gets back to work on the set of Desperate Housewives with her puppy, Jinxy.

Miley Cyrus

Miley Cyrus had her dad, Billy Ray, pull over to pick up a lost dog in Los Angeles on Wednesday. What a sweet girl!

Lauren Conrad

Lauren Conrad and Lo walk her new puppy outside of her new home in Hollywood.

Vanessa Hudgens

Vanessa Hudgens hasn't been seen around Los Angeles lately, but she touched down at LAX late last night with her little poodle and couldn't stop yawning. Looks like she won't be celebrating the holiday with her boyfriend who took off to Europe earlier this week.

Kate Walsh

Katherine Heigl and T.R. Knight aren't the only Grey's actors to support pet adoption. Kate Walsh makes an appearance at the Pedigree dogstore opening in New York where people can adopt shelter dogs and make donations.

Carrie Underwood

Carrie Underwood cuddles with her puppy as she makes her way through LAX. She's in town for the Grammy's and she's got two noms.

Tracee Ross

Tracee Ross takes her Maltipoo out with her to run errands in Los Angeles.

Jessica Simpson

Jessica Simpson and her frequent flyer pooch, Daisy, arrive in New York last night.

Hayden Panetierre

A celeb with a cause is a great thing. For Hayden Panetierre, her passion is saving sea animals. On Sunday the 18-year-old star showed up at a Washington, D.C. demonstration that called for a stop to whale hunting. She spoke to the crowd, saying, "Not only are these animals being cruelly slaughtered, the meat is contaminated by huge levels of mercury. And we're not taking a stand because Japan is one of our biggest allies in the war on terror, but Australia is an ally and they've told Japan what they think, and good on them!"

Last fall she participated in a rally to protest the killing of dolphins in Japan. And she's not done yet. Hayden is visiting the embassies of Iceland, Norway and Japan to discuss the cause. She also has a Web site, Panettiere's Closet, that is selling clothes and accessories from her show. All proceeds go to the Whaleman Foundation.

Pete Wentz and Ashlee Simpson

Ashlee Simpson hangs on to the coffee while boyfriend Pete Wentz takes care of the food and their dog, Hemingway. They dropped by a pet clinic to have him checked out yesterday.

Brit Brit and Pup

Brit Brit headed into the Millennium Dance Complex in North Hollywood last night (after picking up a birdcage and dog food at Petco) to start working on moves for her next video for "Hot as Ice." The routine involves some chair dancing like she did in the "Stronger" video.

On Saturday night, Britney invited two new cameramen into her home for champagne and to discuss her relationship with Adnan. Her manager Sam Lufti stated that they have filed a restraining order against Adnan. Police denied any restraining order had been filed and Adnan stated that he was out of town for the weekend and was not aware there was any problems in his relationship with Britney.

Britney Spears

Britney Spears cuddles with her Yorkie, London, at a gas station in Brentwood. Britney's mom has blasted Dr. Phil for making a statement after visiting Britney in what was supposed to be a private consultation. She claims that he has created more distance between Britney and her mom and sister.

Mariah Carey models her baby GAP clothes and hooker heels while walking with her new Jack Russell terrier in South Beach.