Sydney Sweeney Takes Wild Ride on Top of Plane as It Flips Upside Down

Sydney Sweeney is taking her daredevil streak to insane new heights ... strapping herself to the top of a plane and hanging on for dear life while zooming through the sky.

The "Euphoria" star posted the jaw-dropping video Monday morning ... and immediately called out Hollywood's most famous stunt junkie ... telling Tom Cruise to "watch out."

Sydney explained, "Decided to strap myself to a plane and go upside down 🙃."

And that's exactly what she did.

Sydney is seen wing-walking -- standing on top of the aircraft as the pilot sends the plane through a series of wild aerial maneuvers.

At one point, the plane barrel rolls ... and it also pulls off multiple loops with Sydney still strapped to the wing, looking remarkably calm for someone flying upside down.

As we reported ... Sydney's been making the most of her summer with her beau, Scooter Braun, including a tandem bungee jump in New Zealand that had the pair plunging off a towering cliff.

More recently, the two were spotted soaking up the sun in Mallorca ... and Sydney also channeled Wonder Woman during her "Camp '26" festivities.