Taylor Swift didn't need a breakup song to break hearts tonight.
The 22-year-old debuted her new song, "Ronan," at the third Stand Up to Cancer event, televised Friday on cable and all four major broadcast networks, and there couldn't have been a dry eye in the house when she was finished. Swift shares songwriting credit on the single with Maya Thompson, whose 3-year-old son Ronan died of neuroblastoma last year.
All proceeds from the song, which is now available on iTunes, will go to cancer research. And Swift's simple acoustic performance was just one of many highlights from the reliably star-studded event, which this year was also a tribute to late film and TV producer Laura Ziskin, who lost her battle with breast cancer in June 2011.