A few celebs shared a peek into their end-of-year shenanigans that no doubt featured plenty of bubbly, party hats, and in one particular case, a box of tissues. Hailey and Justin Bieber stuck to tradition and packed on the PDA. Vanessa Hudgens gave a nod to one of her Princess Switch characters . And Kate Beckinsale made a call for fresh breath for everyone in 2020.