Mila Kunis wanted to be the face of Dior because the brand makes her ''feel good''.

The 28-year-old actress - who followed in the footsteps of 'Black Swan' co-star Natalie Portman to sign up to front The Fashion house - admits she has always been ''tentative'' about modelling but is glad she did so for the French company.

She told ELLE magazine: ''I've always been tentative about the idea, but this was an easy decision.

''Why not be a part of a fashion house that I look up to? The truth about Dior is it makes you feel special and I would never want to be part of a brand that didn't make me feel good.''

Mila does enjoy fashion, but admits purchasing expensive clothes designed by the Olsen Twins can be slightly ''insane''.

The 'Ted' beauty said: ''Those girls make the most beautiful clothes and the most expensive clothes ever. It's insane. I'll have to wear them until the end of time!''