Listen up, kids: class is now in session! Just take one look at Christina Aguilera's sexy look at the 2018 Billboard Music Awards and you'll see why. The "Accelerate" singer graced the red carpet in a black and white stripped number that reminded us of the school teacher we wish we had when we were in grade school. Christina paired her made-to-be-seen outfit with black heels, but she didn't let her bold ensemble stop her from having fun on the carpet. The 37-year-old mom of two got playful with her poses, even making silly faces in a few snaps. There's the Xtina that we know! Keep reading to see more of Christina's night at the BMAs from every angle.