Emma, 20, appeared on the Jay Leno chat show to promote her new film but was mortified when Jay produced an old photo of her with unsightly facial hair - looking more like Oasis frontman Liam Gallagher than a budding actress.
She even said it was so bad that her mother suggested getting it waxed while she was still at kindergarten.
Emma said, 'I had a uni-brow for a lot of my childhood.
'I remember being in kindergarten and a boy kept calling me 'uni-brow' all the time.
'My mum said 'maybe we should take you to get your eyebrows waxed sometime soon'.'
She is currently sporting long blonde hair - a switch from the brunette locks favoured by her famous auntie.
Emma will star in horror flick Scream 4.