Celebrities and Jiu-Jitsu

So, I was browsing around and was wondering if any well-known celebrities practiced jiu-jitsu and actually found some of them who do. Among these celebrities are Mel Gibson, Chuck Norris, Ed O'neill (stars in Modern Family as Jay), Guy Ritchie, and Paul Walker.

Here's a video I found of Paul Walker talking a little bit about jiu-jitsu.