Some of your favorite celebrities posted new Instagram snaps to celebrate the first Week of 2015. Stars like Jennifer Lopez and Justin Bieber opted for selfies while Emma Roberts shared a cute throwback photo of her younger self. Beyoncé appeared to have a blast in Cambodia, and Cara Delevingne got creepy in a bizarre photo. Keep reading to see the rest of This week's cutest Celebrity Instagram snaps, and be sure to follow POPSUGAR on Instagram, Facebook, and Twitter.