Rihanna's father wants her to 'rest', amid fears her rocky relationship with Chris Brown is affecting her health.

The singer has cancelled a series of shows on her Diamonds tour as a 'result of illness' in recent months. Rihanna pulled out of a gig in Houston last week, but later raised eyebrows by partying in Miami over the weekend surrounded by champagne bottles. It has now been claimed that Rihanna's on-off romance with Chris is taking its toll on her.

Her dad Ronald Fenty believes she should consider cutting back on her work commitments so she can get back to full health.

'I think she needs a little rest,' he told British magazine Heat. 'I think she might be working too hard. It's taken a toll on her.'

According to insiders, Rihanna and Chris' relationship turned sour again after her ex-boyfriend Drake discussed her on a radio show. The 25-year-old beauty has been left frustrated by the constant arguing and is reportedly struggling to get out of bed.

'She's emotionally drained by the Chris roller-coaster, and she's now worrying if it will even last,' a source said. 'Chris kept Rihanna at arm's length for months last time the Drake thing blew up. The last thing she needed was for it to be brought up again. She's spent most of the tour in her hotel room ' she's feeling so low.'

Chris recently revealed he hasn't quite made peace with his music rival and Rihanna's former flame Drake. Their feud came to a head last year when the pair got into an altercation at a New York nightclub.

However, Chris only has positive things to say about Drake's work.

'I have my differences and he has his. His music's still hot,' Chris said.