Guests at last week's (ends22Oct21) U.S. premiere of Chloe Zhao's new film "Eternals" were stunned to spot the Brit in a bonus scene after the credits had rolled, and he's named in them too, as Eros the Titan, brother of Josh Brolin's supervillain Thanos.
The news has prompted Gwyneth to consider revisiting her own role in the MCU as Pepper Potts.
Guesting on her pal Drew Barrymore's American chat show, she quipped, "This makes me want to dip my toe back into the Marvel Universe."
"Maybe Pepper Potts can intersect with the Harry Styles of it all."
When Drew explained Harry's alter-ego has special powers, including the ability to "stimulate the pleasure centres of anyone within 25 feet," co-host Ross Mathews joked, "This is what they call typecasting."
Drew then wondered, "How does one in the Marvel Universe interpret a god of love and sex? How does that work in the Marvel world?"
And Gwyneth replied, "You just cast Harry Styles. You just put him without a shirt on and there you go."
Gwyneth previously admitted she would be open to returning to the MCU, but only in a small role she could film in "a day or two."