Olivia Wilde believes beauty comes from within.

The 'Rush' actress claims she has never felt so attractive since falling for her fiancé Jason Sudeikis, and credits her loved-up state with making her more confident.

Asked when she feels at her most beautiful, Olivia quipped: ''Since I've been in love with my fiancé, which proves it really starts from within.''

The star has had her fair share of beauty disasters in the past, however, and revealed her hair once went green after a botched dye job.

She laughed: ''I've dyed it so many times for work, I'm surprised it's still attached to my head. Once, many years ago, when dyeing it from blonde to dark brown, it turned green with a black stripe. Not a good look.''

Olivia is a fan of Hollywood screen siren Katharine Hepburn - who shares a similar strong bone structure to her - and likes to take inspiration from the late actress' classic make-up looks.

She told LOOK magazine: ''I've always loved Katharine Hepburn, with her strong brows and cheekbones. I admire her unapologetically powerful aesthetic. Recently, I wore dark burgundy lipstick in her honour.''

The brunette keeps it simple when it comes to her skincare routine and tries to let her pores breathe as much as possible.

She said: ''I just try to be healthy and get rest. I also make sure I'm kind to my skin - I always wash my face before bed, use a good moisturiser and exfoliate at least once a week.''