Credit: Fotonoticias/; Theo Wargo/WireImage for Ray-Ban; Stefania D'Alessandro/Getty Images

Blame it on Twitter.

George Clooney's girlfriend Elisabetta Canalis has been accused of slamming Jen Aniston on Twitter -- by comparing Aniston to scrawny, bug-eyed rocker Iggy Pop -- but she says it's all a misunderstanding.

The Italian model and actress Tweeted on Tuesday: "I JUST READ ON GOOGLE That I TWEETED something bad about J Aniston,let me be clear,it's a complete LIE,I would never do that!!" (A rep confirmed to that the account is bonafide.)

The real story? On Monday Canalis re-tweeted someone else's catty comparison. Originally written in Italian, the dis read: "I'm browsing again through the pages of Rolling Stone. Iggy Pop on the cover looks exactly like Jennifer Aniston."

Canalis said she had "problems" with micro-blogging site Twitter. "I was at the beginning, not sure what 'retweeet' meant," she explained.

She added -- with typos -- Wednesday: "But I don t know what to do with somebody who doesn t understund that it was a MISTAKE to retweet what SOMEBODY ELSE wrote ok?!?"

Canalis, 31, has been dating Clooney, 49, for almost year.