The 'Air Balloon' singer showed off her lengthy locks in all their glory as she stopped by the Victoria and Albert Museum last night (2 April) to see the new Glamour of Italian Fashion 1945-2014 exhibition.
While Mollie King was at the same event sporting a cute designer frock, Lily went for a grunge vibe with black high-waisted jeans and eye-wateringly high heels.
The starlet also wore a leather biker jacket along with a white mesh 'Parental Advisory' T-shirt, which was slightly cropped to reveal a glimpse of her toned tum.
But while her outfit was pretty low-key, her new barnet certainly turned more than a few heads!
Lily has been wearing her hair up a lot recently but this time she opted for poker straight locks which were so long, they hit her belly button!
She wore her fringe down and chose simple make-up with thick black liner and mascara teamed with neutral lips.
And despite attending a very prestigious VIP event, Lils brightened up her evening by showing off her fun side...
Hmmm... we've not seen that pose before. Wonder if it will catch on?!
What do you think of Lily's hair? Let us know by commenting below as the best comment across the site each week wins £50!
Got an iPad or iPhone? Reveal Mag is specially designed to fit!