New Delhi, Sep 22 (ANI): Rumours are rife that Russell Brand and Jemima Khan have split, after the couple recently unfollowed each other on Twitter. According to sources, the couple's relationship had simply run its course, a leading daily reported. Before Khan, Brand was married to pop star Katy Perry and has had flings with supermodel Kate Moss and Spice Girl Geri Halliwell, while Khan has two sons from her marriage to Pakistani cricketer-turned-politician Imran Khan.