Kate Beckinsale is completely unrecognizable with new blonde bob!

Kate Beckinsale has ditched her trademark long brown locks in favor of a new hairstyle!

The British beauty, who turns 46 later this week, debuted her makeover in a selfie posted to Instagram on Monday. According to her caption, the new blonde bob is for her upcoming role in the action-comedy film Jolt, which will also reportedly feature Stanley Tucci and Laverne Cox.

The selfie preceded a number of other selfies of Beckinsale showing off her locks.

Production on the film began this month, with filming taking place in the UK and Bulgaria.

It's not clear if Kate's new look is a wig or the work of a very talented hairstylist (she was spotted at Wimbledon a few days prior with fresh highlights!), but she's just one of the many other celebrities hopping on the summer blonde bandwagon, including Lily Aldridge, Serena Williams, Bella Hadid and Celine Dion.

See more of Beckinsale over the years

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