Well hello there, Christina Aguilera! Friday marked the singer's 35th birthday where fans around the world were quick to wish the proud mom a happy day.But as Friday night came around, the "Beautiful" singer decided to heat thinks up with a little black dress and special message to her fans. "Thank you for all the Bday wishes!!" she wrote on Instagram with knee-high boots and bright red lipstick completing her look. "Love you my #fighters! Xo Xtina." And to think this pop superstar is a mother to two kids? Impressive if we do say so ourselves.