The reality TV star has transformed her cute bob into sleek long locks - and shown off the results on her Twitter page.
Alongside a picture of her new style, 21-year-old Lucy wrote the message: "Love my new hair!!! Thank you @Easilocks."
Lucy changed her look just before she joined the TOWIE cast on a trip to America's famous Sin City.
Sam and Billie Faiers, Ferne McCann, Gemma Collins and Bobby Norris were all sharing their excitement on social media as they arrived at Gatwick in preparation for the long haul flight.
Bobby shared several pictures of the pals waiting for their flight in the Virgin Atlantic V lounge. With one photo, he wrote the caption: "The @OnlyWayIsEssex gang!! Loving life #BucksFizz x x."
He then posted another pic - where Sam can be seen trying to sleep in the corner - with the message: "'Aww @SamanthaFaiers has already passed out! Haha with @BillieFaiers @lucy_meck @fernemccann @missgemcollins #Vegas."
Meanwhile, Sam jokingly tweeted at Lucy's expense, saying: "At the airport VEGAS baby!!!! Glass of champers !!! @lucy_meck is already being a diva demanding extra leg room."
It was announced earlier this month that the TOWIE stars were heading to Las Vegas, Nevada, to film two hour-long specials.
Executive producer Phil Harris said: "After the success of The Only Way Is Marbs, we wanted to kick off our 10th series in style, and where better to do that than Vegas?"
The new series of TOWIE is due to kick off on ITV2 next month...
Do you like Lucy's new hair extensions or prefer her bob? Tell us what you think in the comment box below!