Christian Louboutin is this 'Clou Neoud 150mm' spiked slingback sandals. It is so popular that the biggest Hollywood stars and starlets are often seen wearing it. It is not surprising that other brands are also inspired by it.
N.Y.L.A.'s 'Genevieve' spiked slingback version without the red soles and with fewer spikes. This sells at Nordstrom for $104.95.