NEW YOK: Chris Brown is planning to surprise Rihanna while she is away on her 'Diamonds' world tour. The singer - who reunited with the popstar last year despite still being on probation for violently beating her in 2009 - really misses his on/off girlfriend and can't wait to spend more quality time with her after several weeks of barely seeing her. A source close to the R&B star told HollywoodLife.com: ''He's trying to get to her and he wants too but damn, his schedule is crazy. He missed her when she was in LA and sick and then had to go to NYC for some biz so the timing just didn't work out.”–GN