Scarlett Johansson and Sean Penn showed up on Saturday at Reese Witherspoon’s wedding to Jim Toth, and made their debut as an official couple!

When the farm-style bash was over, Penn and Johansson stopped by Jimmy’s Bar at Ojai Inn and Spa for a nightcap and late-night grub.

According to an eyewitness, Johnasson (wearing a low-cut black with dress, black shawl, and red lipstick) was rattled by all the stares at the packed bar. “This is so terrifying,” she muttered to suit-clad Penn, who held her hand as he led her to their seat.

After the duo ordered gin and tonics, pizza and a club sandwich, they were joined by actor Tom Hooper and a female pal. The Iron Man 2 star gushed about the wedding — and the cake! “It was so great!” she told the table.

After the table cleared, she sat in Penn’s lap — and they made out in full view for 15 minutes, according to the observer.

An insider recently told Us that Johansson, who split from hubby Ryan Reynolds last December is “head over heels” for Penn.

I think this is kinda of a weird pair, but whatever it’s Hollywood, I give it a few months!

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