And while she teased us with some snaps of her new do in progress, it wasn't until last night that we got to see it properly at the Resort 2014 Odabash Macdonald Collection launch party in London's ME Hotel...
The gorgeous photo came courtesy of fashion designer, Julien MacDonald, who was launching a stunning new swimwear collection with luxury holiday lifestyle brand, Melissa Odabash.
"Loving my new chocolate brown locks god bless my amazing hairdresser @malcmurphyhair," Lydia tweeted from the party.
And yes, Lydia, we're totally loving your new locks, too.
Well done to her fabulous hairdresser Malcolm Murphy, who's successfully been transforming the ex-TOWIE hottie for a while now.
The new chocolate brown extensions work perfectly with her creamy skin and we LOVE the strong, smoky eye make-up which is the icing on the cake of Lydia's little makeover!
Lydia was joined by the likes of Dionne Bromfield, Zara Martin, Mollie King and Made in Chelsea's Rosie Fortescue last night, who all looked like Ibizan goddesses for the glamorous event.
Very fitting for a swimwear launch party, don'tcha think?!
Do you like Lydia's new long, brown hairdo? Let us know below. Our fave comment across the site each week wins £50!