Ciara in plunging white dress as she leaves Jimmy Kimmel Live!

She has a big night coming up on Sunday when she'll co-host the Billboard Music Awards.

Thursday Ciara  looked drop dead gorgeous in a white dress with a very plunging neckline and a skirt split to the top of the thigh. 

Her frock had spaghetti straps and a patterned band around her upper waist, just under her bosom.

The blonde singer and model styled her hair in long tumbling waves that fell down over one shoulder.

She wore red lip color and and accentuated her brows and eyes with dusky shadow and black liner and mascara. 

Ciara, who appeared on the ABC late night talk show with her BBMA co-host Ludacris, was accompanied to the taping in Hollywood by her fiance Russell Wilson.

The Seattle Seahawks quarterback, 27, was more casually dressed than his stunning fiancee.

He wore dark blue slacks with a matching jacket over a gray t-shirt and a white Nike baseball cap.