Look at that tiny waist!
The singer looked VAMPALICIOUS at the Long Island auditions for the show on Thursday, dressed in a Hellessy keyhole top and Theory pedal pushers cinched together with a ribbed leather belt.
She added just a touch of color with red & black Saint Laurent pumps and a bold red lip.
And doesn't she look AMAZE with those Marilyn Monroe-style waves???
[Image courtesy of Fox]