Lee Ji-Eun (Hangul: 이지은; born May 16, 1993), commonly known by the stage name of IU (아이유) is a South Korean singer.
IU debuted on September 24, 2008 with her first mini-album, Lost and Found, in which she was praised by various Korean artists for her strong vocals. On April 16, 2009, IU returned with her first full album, titled Growing Up, with her title song being "Boo." She started promotions for the album on the 17th. Within three weeks, "Boo" went up to the #1 contendants for SBS Inkigayo, and her name also went up twice on Take 7 together with other notable artists like SG Wannabe and YounHa. The song also did well on KBS Music Bank K-Chart, on Mnet M!Countdown chart, and on various online music charts.