So long, Blair Waldorf! Leighton Meester, famously bid adieu to her natural blonde locks back in 2006 when she dyed them brown to set herself apart from Blake Lively mid-Gossip Girl audition, and has remained largely brunette ever since. Well, Meester has just taken it back to her roots and then some as she’s now a full-blown platinum blonde!

The Making History star paid a visit to colorist Aura Friedman at Nexxus Salon in NYC yesterday for the six-hour long process, transforming her hair from a light chestnut hue to the shade Kim Kardashian West’s stylist, Chris Appleton, predicts will be the hottest of the summer season.

“With Leighton’s very fairy-like features, I wanted a softer platinum that would complement [them], and not take over,” Friedman said in a press release.

From the looks of things, she nailed it: “Having a blonde moment,” the actress posted of her ‘do.

More than mastering the perfect color, however, keeping the mommy of one’s tresses free of damage throughout the process was of utmost importance. “I love trying new looks and playing around with my hair,” the star told Nexxus. “But, that means it goes through so much damage, especially when I’m at work. So it is important that I keep my hair looking and feeling healthy.”

Luckily, Friedman was able to do just that thanks to the brand’s Nexxus Keraphix Protein Treatment ($16) and Mask ($5), both of which were designed with restorative proteins to heal visible damage — a single dose of the solution reportedly contains enough treatment to replace an entire YEAR of protein loss.

While it’s always a good idea to visit a salon when making a drastic color-change, you can keep your newly dyed strands as healthy as the RL Blair’s with the same Platinum Collection Box ($40) Meester uses (Kim Kardashian West is also a fan of the brand’s restorative treatments), which comes complete with a Keraphix gel treatment, shampoo, conditioner, and masque. Oh, and did we mention it’s 25 percent off?! Sold!

 What do you think of Leighton’s new *lewk?* Sound off over @BritandCo.

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(Photos via Michael Simon/Startracks + Mireya Acierto/Getty)