Christina Aguilera debuted her post-baby 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 laying 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 some time in 2015.
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