I Am... World Tour (sometimes referred to as the I Am... Tour) was the fourth concert tour by American recording artist Beyoncé. It was launched in support of her third studio album, I Am... Sasha Fierce (2008). The tour was announced in October 2008 and the first dates were revealed in December 2008. It kicked off in late-March 2009 with five rehearsal shows in North America, officially commencing in late April 2009.