Pop divas/fashionistas Jennifer Lopez and Rihanna are battling it out off the music charts in the same black leather Lanvin Spring 2010 dress, both also sporting over-the-top 'dos.

Lopez stayed true to the designer's look by pairing her dress with a Lanvin statement necklace and the same big bun worn by the models in Lanvin's Spring 2010 runway show. Her gigantic hairdo was the focal point of the outfit, giving the sexy songstress a Marge Simpson meets high fashion appeal.

J.Lo also accessorized with a wide, leather belt, Jimmy Choo "Cecile" clutch, and a pair of black satin Ferragamo heels for added height -- although with that hair, height was certainly not an issue!

Rihanna chose simple neutral heels and no accessories at all, topping off her look with a pop of color -- her signature matador-red bowl cut.

Both ladies definitely stunned in the Lanvin dress, but who wore it better? Vote now and then check out Rihanna's skimpy animal-print one-piece.