The never at a loss for words Megan Fox blasted Twilight heartthrob Robert Pattinson as being “too immature” to take seriously as a romantic partner in an interview with the May issue of Elle Magazine, but according to this new report, Megan’s very public Pattz diss was the result of the actor blowing her off after a clandestine one night stand earlier this year.

Informants close to Megan claim the 22-year-old brunette bombshell bragged about “hooking up” with the British actor to workers on the set of her upcoming film Jennifer’s Body. Things apparently went south after Robert didn’t return Megan’s feelings — or her phone calls — and unceremonially “blew her off.”

“Megan was totally into [Rob] and thought he was really cute. But nothing ever went further than one night they were together. He totally blew her off,” one spy blabs.