Brandon Davis Denies Writing Mischa Barton “Fat” Tweet

Mischa Barton was reportedly devastated after her ill-received Easter Sunday “Big Banana Jeans” made her the laughing stock of style blogs and the target of an online smear campaign by her former flame, oil heir (and Elvis doopelganger) Brandon Davis — but Davis has fired back, insisting he never poked fun at ex’s infamous pants or her recent weight gain.

And outraged “Greasy Bear” — who coined the phrase “Firecrotch” to the chagrin of actress Lindsay Lohan — claims he doesn’t even have a Twitter account and is emphatic that he never used the social networking service to hurt Mischa.

“Omg (oh my God). Just realised my ex turned in to 1 of the fattest people on the planet. I’m gonna start dating plus size models. Not! Mischa the Hefer (sic),” read a Tweet that hit cyberspace last Wednesday.

Brandon fumed to In Touch Weekly: “I would never say anything nasty about Mischa, especially about her weight. I am pissed that someone stole my identity and started Twittering things.”