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It seems like one man hasn't been watching those ads in which a couple of Australians dish out relationship advice closely enough.

A car was spotted this week in Birmingham that proves men should never say another woman is better-looking than their other half, no matter what the circumstances.

Right down the side in white spray paint read the words: "Is Pippa's Bum Still Better Than Mine???", apparently in reference to the Duchess of Cambridge's sister Pippa Middleton.

The bridesmaid hit headlines worldwide in her clingy white frock during April's royal wedding, but this guy apparently made the mistake of commenting on her derriere in front of his girlfriend - and is now paying for it.

"He wasn't hanging around. He was shielding his face by the looks of it because people were pointing and laughing at him," chuckled passerby Mathew Growcoot.

A host of Facebook pages have now sprung up paying tribute to Pippa's physique, leading her to become almost as famous as her sister.

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