Tennis and Pop Music Mix

This upcoming weekend is a big one for tennis star Andy Roddick, 26. But this time, it's not a tournament.

Instead, Roddick is set to wed swimsuit model Brooklyn Decker, 21, at his home in Austin, Texas, reports People magazine. Among the celebrity guests are Steffi Graf and Andre Agassi. Sir Elton John will also perform.

Roddick and John know each other through their involvement in charity work. In 2007, John, 62, performed at the Andy Roddick Foundation's Charity Gala and in 2008, Roddick led "Team Elton John" in the Advanta WTT Smash Hits event, raising over $400,000 for the Elton John AIDS Foundation.

The couple met in 2007 when Roddick saw Decker in a magazine and asked his agent to get her number. They started dating a few months later and got engaged in March 2008, according to TransWorldNews.com.