Calum BestCalum BestYikes, what's got Calum Best's knickers in a knot?

The party animal has been ranting about on/ off girlfriend Sarah Harding.

The Sun reports that ladies' man Calum let rip to friends in a pub in Islington, London.

Sarah - who lent a shoulder to cry on when Calum's dad, George Best, died -came in for a bit of a tongue lashing, it seems.

The ex-model supposedly told his pals the Girls Aloud beauty is "stupid" and "boring" and he was only interested in her looks.

The newspaper quotes one of his mates as saying: "Calum was really laying into her, saying she isn't what she seems.

"He said he isn't surprised that she's single because she can't make conversation and puts on this act of being a wild party girl when she's really quite dull."

Calum Best and Sarah HardingCalum and Sarah HardingWhat's more, Calum - who has dated Jodie Marsh and Big Brother's Orlaith McAllister, among others - apparently reckons Sarah is one of the only girls he regrets dating.

Safe to say things are more off than on at the moment then, eh?