Kristen Bell has only been on Instagram for a short while, but she's already proven herself to be a social media superstar with incredible behind-the-scenes photos with her famous friends. The latest photo from the Bad Moms actress? A series of sweet snaps with her Frozen costars Idina Menzel and Josh Gad at a benefit for Idina's A BroaderWay Foundation last weekend. The trio posed for a selfie, and Kristen and Idina channelled their inner princesses while they belted out tunes as Anna and Elsa. Although there's still no word on whether or not the cast will be reprising their roles in the upcoming Broadway adaptation of the Disney hit, their fun reunion was a welcome surprise. Keep reading to see more photos from their night out!