Can You Believe Christina Aguilera Gave Birth 3 Months Ago?

Christina Aguilera debuted her postbaby body when she made an appearance alongside fiancé Matthew Rutler at the Breakthrough Prize Awards in Mountain View, CA, on Sunday. The singer is getting back into the swing of things after giving birth to her daughter, Summer Rain Rutler, in August. Christina has been lying low since giving birth, taking time to relax with her new baby and work on new music. Back in October, she announced that her new tunes will be hitting the shelves in 2015. Christina also confirmed that she would be returning for another season of The Voice, replacing judge Gwen Stefani. Keep reading to see more photos from Christina and Matthew's night out!