The London Sun claims the actress will pocket around $20 million to reprise her role in the next "Avengers" installment.
"Scarlett is the hottest star in Hollywood, and her inclusion in the sequel is a must," gushes a source. "Producers think that as the only lead woman in the film, male fans have found her a key ingredient -- both for sex and story appeal."
Her chemistry with Jeremy Renner didn't hurt, either.
Concludes the spy, "This says, 'We value you.' Everyone is confident she'll sign and be ready for 2013 filming."
Until then, click on for more photos of Scarlett looking hot in a two-piece …