Chris Brown is planning to surprise Rihanna while she is away on her 'Diamonds' world tour.

The 'Fine China' singer - who reunited with the 25-year-old 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 23-year-old R&B star told ''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.

''All that dude wants is for her to do her shows and take care of her health. That's the number one thing he wants her to do. But other than that, he gone try to get out to see another show of hers just as soon as he can. Might be sooner than later too.''

The couple were recently forced to deny rumours they are expecting their first child as Rihanna has been plagued by illness while on tour, which has led her to cancel a number of performances.

A source previously said: ''[Rihanna] is just sick, and that's really it.

''I know, that's not a good enough reason because everybody wants some drama and the rumours that she's pregnant to make the rounds, but sorry, not this time. She's not pregnant!''