Jessica Alba puts her flawless skin down to ''shocking'' Korean face masks.

The 'Sin City' actress enjoys perfecting her glowing complexion using the facial products despite looking like a ''serial killer'' during the treatment.

She told People magazine: ''When I put on one of those face masks - the best ones are from Korea - it's definitely shocking.

''I look like a serial killer from an '80s horror movie.''

The 33-year-old beauty - who founded Honest, a company specialising in eco-friendly body and baby products in 2012 - recently joined the Movember movement, which encourages men to grow moustaches to raise awareness of prostate and testicular cancer.

Jessica - whose company is donating $1 from certain purchases towards the cause - described the initiative as ''cool'' and ''memorable'' and is trying to convince her husband, Cash Warren, to grow a moustache of his own.

She said: ''Movember is important to me because I've got men in my life that I want to live the longest and healthiest lives possible - my dad, my husband and my brother.

''Men are 24 percent less likely to have visited the doctor in the past year, so it's a cool, memorable way to remind men that we're looking out for them and that they need to take care of themselves.

''My brother does it every year, but my father and husband take a little more convincing.

''This cause has picked up so much steam, and more of my friends are doing it every year.''