Lady Gaga took the stage for a special performance at the Parker Institute for Cancer Immunotherapy launch on Wednesday night in Los Angeles. The event celebrated tech billionaire Sean Parker's donation of $250 million to help find a way to treat cancer through immunotherapy. 

Gaga performed her usual set of jazz standards, including "New York, New York," "La Vie En Rose," "Let's Face the Music and Dance," "Little Coquette," as well as her own hits "You & I" and "Bad Romance."

Watch Gaga sing a stunning acoustic rendition of "Bad Romance" below...

Sean Parker is the founder of the music service Napster and the founding president of Facebook. Parker's donation is the largest ever for cancer immunotherapy and one of the largest for cancer research.