National Cleavage Day (abbreviated NCD)[1] was an annual celebration held in South Africa, sponsored by the brassiere marketer Wonderbra.[2] National Cleavage Day was started in 2002 and held at the end of March or the beginning of April every year.[3] Wonderbra together with Cosmopolitan magazine and 5fm, an SABC radio station mainly based in Johannesburg, sponsored the celebration.[4]