Taking to Instagram, the 23-year-old revealed a shiny blonde bob, leaving her followers shocked.
Lucy wrote: "What do you think?? Behind the scenes shooting for Ellesse at @VeryUK [sic]."
The former TOWIE star's fans, although knocked back by the drastic image change, were quick to compliment her – and one even said she looked like Britney Spears.
But, if you don't love Lucy blonde, don't worry: she later revealed it was just a wig with a gorgeous new selfie, showing off her perfect natural hair.
Meanwhile Lucy recently opened up about her relationship with Olympic gymnast Louis Smith, admitting that, while they're both incredibly fit, they don't work out together.
She told Reveal magazine: "We don't have time to. We don't live that close to each other, so it would be difficult to train together.
"And he's training daily, we tend to just relax when we see each other. I', also a morning person. I like to train first thing in the morning so it sets me up for the day."
Lucy added: "It's important for a guy to look after himself so it helps that we are both so into fitness, as we have a mutual understanding for what we do."