Who: Pop star Rihanna

What: Rihanna performs on the finale of the X Factor UK live Sunday, December 9, 2012.

Dress: She’s wearing all Alexander Wang spring 2013 pieces. A white croc embossed round neck top and a matching skirt. On her feet was the clear runway gladiator peep-toe heels.

Rihanna X Factor White Alexander Wang Dress Performance December 8, 2012

Rihanna X Factor White Alexander Wang Dress Performance December 8, 2012

Rihanna X Factor White Alexander Wang Dress Performance December 8, 2012