Jessica Alba relates to feelings of self doubt and feeling judged.

The 'Sin City: A Dame to Kill For' actress has recently opened up about her insecurities as a young woman and has now teamed up with Braun's 'Break Free' campaign in a bid to spread positivity amongst women.

She said of her involvement: ''I completely relate to feelings of self-doubt and feeling judged but, happily, I also know personally how wonderfully empowering female positive reinforcement is.

''I'm encouraging women to say, share and show their support to female friends, family, colleagues - sisters everywhere.

''Let's give each other the confidence to break free from self-doubt and all walk that little bit taller. Think of a woman you admire today and tell her!''

The 'Break Free' campaign follows research that revealed 91 per cent of women feel judged in everyday scenarios and 85 per cent lack the faith that other women admire them.

In addition, it also found that 62 per cent of women value compliments from other women with a fifth admitting positive comments could stay with them for life.]

Jessica recently admitted: ''In my teens and my 20s I just wasn't sure of myself and I was always kind of insecure and felt I needed to apologize for myself.''

As part of the campaign, the 33-year-old actress kicked off a positivity chain, encouraging other women to join in by writing a #breakfree message of support to a fellow female and uploading it to YouTube.