On Saturday (18 January) the actress headed to London's Inanch salon, a favourite with stars like Sam Faiers, Abbey Clancy and Rochelle Humes.
Her light brown 'do was switched for a blonde hue with flattering highlights. But it was Mischa's sleek 'n' chic cut that really had us swooning.
She opted for the hair length du jour, a shoulder-skimming style known as the 'long bob.' The team at Inanch added a sweeping side fringe to really up the sex appeal.
The mid-length cut is huge in celebville right now - Fearne Cotton debuted a pink version in December and Lucy Mecklenburgh has been shunning the extensions in favour of a shorter look for a while now.
Not quite as scary as your classic bob, it's low maintenance, flatters pretty much every face shape and works with both a centre or side parting.
A wonder cut? We think so!
It seems Mischa was super-pleased with her new bouffant too, tweeting '@InanchLondon thanks for the beautiful do as always guys!! I got my sexy bob for the next character...'
Her new film is a psychological thriller called The Hoarder in which Mischa stars alongside former Inbetweeners actress Emily Atack.
We can't wait to see it - not just for the fabulous hair, promise!
What do you think of Mischa's new haircut? Tell us below as the best comment from across the site each week wins £50!