Oscar winner Natalie Portman can certainly act, but if awards were passed out for spotting stoned people, she’d be snubbed! (Watch the video below.)

The “May December” star played a game of “Who’s High?” with comedian Jimmy Kimmel on Thursday, trying to guess who, among a trio of pedestrians, was baked.

“It’s a good skill to have as a parent,” Portman said in the “Jimmy Kimmel Live” segment.

The three — Roisin from Ireland, Marcus from Los Angeles and Savanna from Nashville — answered questions from the “Star Wars” alum as she tried to pick out who’d had pot.

Roisin’s revelation that Doritos were the last thing she’d eaten caught Kimmel’s and Portman’s attention. But a close-up shot of Savanna’s eyes left Portman second-guessing herself.

“I’m having some serious doubts,” she said. “Savanna is suspicious.”

Marcus, a retired assistant principal, was a long shot to be high in public, Kimmel reasoned.

So who was buzzed? Check out the video at 3:42:

Kimmel and Portman eventually settled on Roisin. But they were wrong. It was Savanna.

No Hollywood ending for Portman this time.