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Christina Milian had a belated birthday celebration at Rose Restaurant in West Hollywood Wednesday, where she showed off her gorgeous figure with a plunging neckline!

The songstress went bra-less and glamorous for the bash, thrown by her mom and pal Teyana Taylor. Milian joked about the celebration via Twitter:
"I just realized that I might as well declare this Birthday.. '30 days of my 30th Bday'!"

Hot mama Milian enjoyed the party after a day of parenthood -- she took daughter Violet to her first day of "Mommy and Me" class! Too cute!