Rihanna's father was thrown out of her Diamond Ball.

The 'We Found Love' singer staged a lavish charity event in aid of her Clara-Lionel Foundation charity in Beverly Hills last week but her dad Ronald Fenty didn't even get to see her as security asked him to leave because he was drinking.

Ronald - who Rihanna sent home from her US tour six years ago because of his drunken behaviour, sparking a two-year estrangement - said: ''I had Johnny Walker Black. I had two doubles man and tripped over a chair.

''I had been on the [red] carpet for the pictures, I meet a couple of famous people I knew go and talked with them, and then somebody left a chair and I stepped back and fell over, I saw my ex [Monica Braithwaite, Rihanna's mother] look up, and within a few minutes after the picture was taken, security came up and said 'We're taking you home'.

''I said, 'But I haven't seen my daughter yet' and they said, 'Don't matter man. Please do not make a scene it will reflect on your daughter.' ''

A year ago, Rihanna paid for Ronald to endure a month-long stay at a luxury rehab clinic in Malibu and he knows she will be disappointed in his behaviour.

He told the MailOnline website: ''I'm sad how it ended of course, I should have never taken that first drink or any drink for that matter. I wish I had seen her of course.

''She will probably hear how I was and how I had a few drinks, so I guess she would be angry with me. I think she is, I'm not sure, we haven't spoken just yet.

''I feel bad because I let her down because she spend all that money putting me in rehab, [and] then find me drunk somewhere. It is not good. What can I say but I'm sorry. It's me who f**ed up.''

Ronald explained he had turned to alcohol because he felt ''down'' that his daughter hadn't invited her half-brother and half-sister to the glitzy event, though other family members were there.

Despite the incident, Ronald - who has previously battled addiction to crack cocaine - insists he isn't an alcoholic.

He said: ''Me, no, drunk and disorderly. I don't see myself as an alcoholic, I don't realise when I get that drunk.

''Call me a drunk or alcoholic in denial, whatever you want to call me but I have realised I could drink or not drink.''