Christina Aguilera was a sight to behold during the opening night of her Las Vegas residency -- showing off an incredible 40 lb. weight loss.
The singer belted out her catalog of hits Saturday from The Voltaire at The Venetian, Xtina's strong and slender figure was front and center in a series of tight leotards and thigh-high boots.
GettyAfter years of scrutiny for her fluctuating weight, XTINA's maintaining a healthy physique ... previously admitting she hated being skinny and loved her booty.
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