She matched her dress with her new ombre hairstyle which is blonde from the roots, turning into lilac and then hot pink on the tips.
The mother-of-one had a big smile throughout the event and accessorized with sparkly rings and a pair of killer heels.
Christina says she is loving her new curvaceous figure and is embracing her shape rather than going on a crash diet to lose some pounds.
"The challenge I've always had is being too thin," she told Lucky magazine recently.
"So I love that now I have a booty and obviously love showing my cleavage."
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