She may play a demure debutante on Bridgerton, but British actress is a baddie in real life!

Genevieve, 27, didn’t hesitate to confront thugs who threatened to stab her multiple times after trying to steal her phone.

The star, who played Clara Livingston in the third season of the hit Netflix series, was at a Joe & the Juice in London’s posh Kensington neighborhood when sticky-fingered , 18, snuck up behind her when her back was turned and her friend had left the table.

The hoodie-wearing thief slyly swiped her phone, but Genevieve quickly realized what had happened and sprang into action, jumping up and grappling with the teen bandit until he dropped the phone. The bold beauty then picked it up and smacked him with it!

On Instagram, Genevieve, a former Team GB artistic swimmer, posted clips of the confrontation and shared that Boulares also had an underage accomplice.

“The guy that walks up to me at the end was the man threatening to stab me multiple times,” Genevieve wrote on a June 11 Instagram Story.

“That was the moment something took over me and the physical fight became life or death in my mind. Crazy, watching the beginning of this footage, it gives me chills.”

She said later: “I was left with a concussion… and since then, I’ve felt constantly on edge.”

Boulares, a convicted thief who served time for threatening to behead Welsh singer while stealing his $23,000 Rolex, pleaded guilty to the theft. He was set to be sentenced on June 17.