Rihanna splashes $1 million on rare Mercedes for Chris Brown's birthday

Pop megastar and provocative Tweeter Rihanna has reportedly spent over $1 million on a personalised Mercedes-Benz SLR McLaren Stirling Moss for on/off lover Chris Brown.

The car in question is the ultra-exclusive, 640bhp Stirling Moss edition of the famous SLR McLaren that boasts a completely open-top motoring experience and eye-catching side exit exhausts.