Lady Gaga sings for Bill Clinton at foundation gala

Gaga did her best impersonation of Marilyn Monroe as she belted out a special version of Bad Romance. (Photo: Yahoo!)

Donning a get-up harkening to the days of Marilyn Monroe singing to John F. Kennedy, Lady Gaga stole the show at Bill Clinton's foundation gala on Saturday night.

Gaga took to the stage at the Hollywood Bowl and serenaded the former president with a special rendition of one of her hit songs. She changed the lyrics of "Bad Romance" to "Bill Romance" in front of thousands.

The party not only was a belated celebration of Clinton's 65th birthday but also commemorated the 10th anniversary of Clinton's foundation, which helps protect the environment and improve global health.