sunglasses Bradley Cooper hat hospital v Cassius Clay

After he made an appearance at the Hollywood Foreign Press Association's 2012 Installation Luncheon at the Beverly Hills Hotel, Bradley Cooper paid a visit to the Cedars-Sinai medical center on Thursday afternoon. Fitting in some last minute charity work perhaps?

The Hangover star looked casual cool in a Cassius Clay, aka Muhammad Ali, tee that showed off his sexy arms, paired with jeans, a baseball hat and vintage shades.

Cooper was joined at the lunch by Jennifer Lawrence who he will be traveling with this Fall while promoting their upcoming flick, Silver Linings Playbook, in November, before he heads to Las Vegas to begin work on The Hangover Part III.