In addition to celebrating the Labor Day weekend with lots of fun, sun, and relaxation, some of our favorite snap-happy stars also shared moments on the set or in the studio. Take, for instance, Gisele Bündchen, who hopped on the mic for charity and posted a photo of her recording session via social media. Fellow model Behati Prinsloo posed in a cheeky, custom-made crop top, while stylish moms Jessica Alba and Nicole Richie both got love from their little ones. John Stamos and his former Full House costar Ashley Olsen reunited in the cutest way possible, while Liv Tyler and Steve Zahn linked up for a funny photo shoot after starring together in That Thing You Do 17 years ago. We also saw Nina Dobrev buying a kimono and Chrissy Teigen hitting the beach — and can you guess which actress made a pit stop at Walmart for a Darth Vader mask?