Oscar winner Charlize Theron is back on the big screen this summer opposite Will Smith and Jason Bateman in the offbeat superhero action-comedy 'Hancock' -- and she's setting the wildest rumors straight for ET's Kevin Frazier!

"Somebody said to me there's a story about me o.d.-ing on Botox -- that I basically shot myself to death with Botox -- and I'm here to tell you that it's true," Charlize jokes, adding that another rumor she heard said she's a man!

In 'Hancock,' flying into theaters everywhere July 2, Charlize stars as the wife of Jason Bateman, who plays a public relations exec whose life is saved by reluctant superhero Will Smith.

The onscreen couple have a Thursday "Spaghetti Night" tradition in the movie, and ET decided to treat the film's stars to their own plate of pasta, provided by Fresco by Scotto in New York!

"Look at this! Those are big meatballs," beams Charlize, who almost spills the bowl into her lap -- and then reveals that Jason never swallowed a single bite of spaghetti on the set!

"Jason had a spit bucket," she explains. "If the actual carb went down the throat, he would make himself throw up -- that's how anti-carb he is!"

Moments later, when Jason walks in on Charlize's interview, she chides him to eat a bite of her delicious dish!

"Come on, have some carbs! For me! For me!" pleads Charlize.

"This body is no fluke and I can't eat carbs," protests Jason with a smile. "Otherwise you lose what's going on right now -- [now] that everybody's enjoying this bone structure."

For more with Charlize and Jason's spaghetti incident, watch tonight's ET!