Lady Gaga performed for President Bill Clinton on Saturday night (Oct. 15) at the Hollywood Bowl during a concert celebrating the 10th anniversary of The William J. Clinton Foundation.  The pop superstar emerged on stage atop an all-white treehouse, sporting a modern Marilyn Monroe look.  She switched up her lyrics a bit during the performance, changing the title of ‘Bad Romance’ to ‘Bill Romance’, as she flirted with and serenaded the former President.

Other performances included Motown legend Stevie Wonder, country star Kenny Chesney, Somali rapper K’Naan, Colombian crooner Juanes, R&B singer Usher, and closing out the show, Bono and The Edge of U2.

Ellen DeGeneres, Maria Bello, Ashton Kutcher, Jason Segel, Colin Farrell and Chevy Chase were some of the famous attendees at the celebration for A Decade of Difference .

Over the past ten years, Clinton’s foundation has sought  to improve global health, strengthen economies worldwide, promote healthier childhoods and protect the environment.