Stewart, who has been dating Twilight hunk Robert Pattinson for three years, stunned Hollywood last week (ends27Jul12) when she confessed to a ""momentary indiscretion"" with her Snow White and the Huntsman director Rupert Sanders and apologised to devotees for the controversy.
Heartbroken Pattinson has since reportedly moved out of the Los Angeles home the couple shared, but the Brit will have to reunite with Stewart in a matter of weeks as they begin to promote the November (12) release of The Twilight Saga: Breaking Dawn - Part 2.
But co-star Serratos is confident ticket sales will not be affected by the couple's fall-out as fans are still invested in the characters they play onscreen.
She tells UsMagazine.com, ""Of course people are fans of us now, but I think above anything, they're fans of these characters. I don't think anyone's really gonna give a s**t. They're gonna see the movie; it's going to be awesome.""