Watch: Taylor Swift Debuts Song 'Ronan' at Stand Up to Cancer Event

The stars joined forces last night for Stand Up to Cancer; the program raises money for cancer research, and celebs like Chelsea Handler and Gwyneth Paltrow came out in support of the cause. Taylor Swift rose to the challenge also, doing what she does best, and in what is perhaps her most heartfelt performance to date.

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"I'm playing a new song 'Ronan' tonight on Stand Up For Cancer. It'll be on iTunes tonight with all my proceeds to cancer related charities," Taylor told her Twitter followers before the show. Taylor wrote "Ronan" about a 3-year-old boy who had a neuroblastoma and passed away last year. She was inspired by a blog post by the boy's mother, Maya Thompson, with whom she shared writing credit.

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The song quickly shot to number 2 on the iTunes chart. If you didn't catch Taylor's performance, you can watch it below.