Joshua Howard Luellen (born February 2, 1989), known professionally as Southside, or by his stage name Young Sizzle, gained recognition in the hip hop industry for producing songs for prominent artists across the American hip hop sphere.

In 2010, Southside and 1017 Brick Squad Mafia artist, Lex Luger, established their record production and songwriting team 808 Mafia. The basis for his stage name came from the place from where Luellen grew up, Southside, Atlanta.