Elton John to sing at Roddick's wedding?

Sir Elton John is reportedly expected to perform at Andy Roddick's wedding to model Brooklyn Decker this weekend.

According to People, the 26-year-old tennis player struck up a firm friendship with Sir Elton through their mutual involvement in charity work.

"He's supposed to perform and everyone's really excited," a source said of the ceremony, which will be held at Roddick's home in Austin, Texas.

Other guests expected at the service include Steffi Graf, Andre Agassi, Marty Fish and James Blake.