Other artists who have appeared on the cover include Kumi Koda, Namie Amuro, Avril Lavigne, Britney Spears, Fergie and Gwen Stefani.
"Sweet Song" is a single released in early 2009 by "Lady Bird feat. Son'i (from Popteen)"; Lady Bird, a dance music duo consisting of DJ Ten and producer Kazuhisa Hirota, and fashion model Wei Son.
She made her singing debut in early 2009 when she released her first single "Sweet Song" with Lady Bird, as "Lady Bird feat. Son'i (from Popteen)" on BMG Japan.