We were seeing double on social media this week! From the set to the beach, celebs were sporting matching looks and taking to Twitter and Instagram to show them off. Hilary Duff snapped a cute photo of her and Skylar Astin's similar sweaters on the set of Flock of Dudes, and Bar Refaeli showed up to the beach wearing the same bikini as her friend. Nicole Richie and Kelly Sawyer wore their festive best for a day at Disneyland, and Candice Swanepoel couldn't help but pair up with a pal during a Victoria's Secret shoot. When they weren't getting matchy-matchy, they were goofing off — Chrissy Teigen got handsy with a pregnant mannequin while newly-engaged Behati Prinsloo had fun with foam gloves and mouse ears!