The One Tree Hill star will head up the Century of the Girl Expo at the Pennsylvania Convention Center in Philadelphia on 21-22 April (12).

Performers Diggy Simmons and Veronica Ballestrini will take to the stage at the event, and the Girl Scouts will hear inspirational talks from speakers including charity:water founder Scott Harrison and United Nations Vice President of Global Partnerships Elizabeth Gore.

Bush says, ""I am honoured to host the upcoming Century of the Girl Expo. I hope to enable young girls to harness their unique importance, find their voice and realise the power of YOU.""