Celebrity How Your Favorite Animal-Loving Stars Are Teaming Up for a Good Cause By Arianna Friedman Arianna Friedman Arianna Friedman is a writer who covers diet and nutrition, as well as lifestyle and entertainment. InStyle's editorial guidelines Updated on December 26, 2016 @ 08:30AM Pin Share Tweet Email Photo: Roy Rochlin/FilmMagic; Bryan Steffy/Getty; Steve Granitz/WireImage What if spreading holiday cheer was as easy as using a hashtag? Thanks to celebrity chef Rachael Ray, it is. This month, the bubbly chef and TV personality issued a social media challenge to her famous friends: post a pic using the hashtag "SantaPaws2016" to raise awareness for animal rescue organizations before Christmas. In exchange, Ray graciously offered to donate $10,000 to an animal charity of their choice courtesy of The Rachael Ray Foundation, which has already donated more than $14 million to pet charities for food, medical supplies, and treatments, among other things. Allison Williams, Lauren Conrad, and Neil Patrick Harris are just a few of the A-list stars who eagerly answered her call and took to Instagram and Twitter to show their support. VIDEO: Scandal's Tony Goldwyn on Making a Difference Check out their posts below. Rachael Ray Ray, who is using proceeds from her pet food to fund the generous contributions, kicked it off with a sweet pic of her dog in front of the Christmas tree. Allison Williams The Girls star 'grammed a pic of her dog, Moxie, noting that it was taken when right after she brought the 10-week old home. "It's the sweetest gesture, and I couldn't be more grateful," Williams wrote about Ray's altruistic offering. Neil Patrick Harris Like Williams, NPH chose to donate to the North Shore Animal League, writing, "This charity is near and dear to our heart - they matched us with our new dog Gidget!" Scarlett Johansson Just Covered a New Order Song for Charity—Hear Her Take on the '80s Hit Lauren Conrad Conrad tweeted her support for Wags and Walks, a Los Angeles-based dog rescue organization. Rachel Bilson Rachel Bilson posted a selfie with her beloved pooch. Hilary Swank Hilary Swank got in on the action with this adorable pic. Her donation supports to her animal rescue organization Hilaroo. Sutton Foster Sutton Foster took it a step further and made a collage of her furry friends in support of The Human Society of New York, adding "'Tis the season for giving!" Whoopi Goldberg Whoopi Goldberg gave a shout-out to Main Line Animal Rescue. Leonardo DiCaprio Ate Lunch with One Lucky Fan for Charity and She Hit on Him Katherine Heigl Katherine Heigl snapped a pic of her playful pup to benefit Hearts United for Animals. Miranda Lambert Miranda Lambert shared a snap of her dog, Delta, to show support for Tulsa Pets. Olivia Munn Olivia Munn repped Love Leo Rescue, the L.A. organization that matched her with her dog, Frankie. Brooklyn Decker Model Brooklyn Decker used this opportunity to promote one of her favorite organizations, Austin Pets Alive!