A picture is worth a thousand words! Julia Roberts -- wearing a t-shirt with Obama's picture on it -- and and her husband Danny Moder joined The Dave Matthews Band, as well as other stars , in New York last night for a benefit concert for Stand Up for a Cure.

Only ET was backstage with Julia, who told us she normally doesn't go out much, but was thrilled to participate in the big night.

Stand Up For a Cure was originally focused exclusively on lung cancer, but now also covers other forms of cancer and HIV/AIDS.

Watch the clip to hear our exclusive interview with Julia!