ST1M (a.k.a. Billy Milligan) (real name Nikita Legostev, Russian: Никита Сергеевич Легостев) is a Russian rapper from Tolyatti, Russia. He was the winner of the Hip-hop.ru Awards 2013 in nominations: "Best music video", "Performer of the year", "Opening of the year" (as Billy Milligan).

Born November 4, 1986. Since 2005 participated in the group "Подземный переход" (Underground crossing). In 2005 he won in the Internet-battle on Hip-hop.ru when he entered the TOP-10 Russian MC's of the 2005.

At 2007 he negotiated the contract with Seryoga and recorded his first scandalous album "Я - Рэп" (I`m Rap). But his subsequent singles were more soft and lyrical, in which he was trying to form his new image.