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Christina Aguilera is one hot mama! 

The pop star and fiance Matt Rutler stunned at the Apollo for a fundraiser in East Hampton, New York on Saturday.  

Xtina looked gorgeous in a plunging black sequined dress with her hair styled in tousled curls, while Matt looked dapper in a gray blazer, a black button down and black skinny jeans. 

Later in the evening, the mother-of-two took the stage wearing a second cleavage-baring gown, and dedicated a song to daughter Summer Rain's papa. 

The cute couple also celebrated their adorable baby girl's first birthday on Sunday. The 34-year-old likewise took to Instagram to mark the special day with a super sweet shot of her little girl. 

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"Happy 1st Birthday! My Sweet, Summer Rain," the "Beautiful" singer posted with the cute candid. 

Aguilera and Rutler -- who have been together since 2010 -- welcomed little Summer on August 16, 2014. Christina also has a 7-year-old son, Max Liron Bratman, from her first marriage to Jordan Bratman

Happiness sure looks good on the "Fighter" singer -- we've never seen Christina look better!

What do you think about "The Voice" star's revealing looks? Sound off below and check out the galleries above to see more pop stars then and now and cute celeb kids!  

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