There are at least 2 artists known as X5. 1) X5 is a Vietnamese girlgroup under Early Risers Media Group. The members are:
Gil Lê (Leader/Rap/Tomboy/Dance)
Lee Panda (Vocal/Dance)
Jenny (Vocal)
Yuu (Model/Vocal)
Hanah (Vocal) Facebook: 1.) http://facebook.com/X5girls
2.) http://facebook.com/welovegil
Official website: http://www.x5girls.com/
Blog: http://mstart.vn/blog/X5girls
Twitter: http://twitter.com/X5girls
Youtube: http://www.youtube.com/X5girls
Fansite: http://x5zone.info

Read more about X5 on Last.fm.