RiRi Cracks A Smile!

There's only one way to break through Rihanna's composure - bring up Chris Brown!

We caught up with the singing sensation as she shopped at Fred Segal yesterday afternoon. As always, Rihanna kept quiet around the paps as she walked back to her car, brushing off pleas for her beauty secrets with a smile. All that changed the instant our photog mentioned Rihanna's main squeeze Chris Brown, however - even the ice queen had to stop and have a chuckle!