Scarlett Johansson's sexy curves and, uh, epic acting skills are worth no less than $20 million, the New York Post reports. Producers of an Avengers sequel are prepared to sign the eye-popping paycheck so she'll reprise her role as Black Widow when filming starts next year. “Scarlett is the hottest star in Hollywood and her inclusion in the sequel is a must," a source tells the Sun. "Producers think that as the only lead woman in the film male fans have found her a key ingredient." Johansson's fee takes second only to Julia Roberts' $25 million for Mona Lisa Smile, a payment reported by Forbes.