She's famous for her enviable California-blonde locks, but it seems redhead.
The Serena Van der Woodsen messy blonde tresses, in favour of impossibly glossy russet curls.
But it wasn't just her new barnet that caught our beady eye - the 23-year-old also showed off her hourglass curves in a figure-hugging aqua blue Zuhair Murad couture gown - the perfect colour contrast on which to showcase her new hair hue.
Whether for a film role, or whether she just fancied a change, remains to be seen - but either way, we're not yet 10020lively/">Blake Lively as a ravishing redhead? Let us know below!