The former Coronation Street star, 23, looked like a sparkling siren when she attended the annual Mirror Ball last night (7 March), in support of Forever Manchester which raises money for local charities.
Helen - who has a tattoo of Marilyn on her left arm - could have been wearing a dress straight out of Marilyn's vintage wardrobe.
The former I'm A Celebrity contestant looked super glamorous in a strapless silver, floor-length gown which accentuated her womanly figure.
She teamed the stunning dress with silver strappy heels and a black Chanel clutch bag.
Her recently-dyed brunette locks also added to the more elegant look.
Fellow TV stars Chelsee Healey and Catherine Tyldesley also attended the Hollywood-themed fundraising event at Manchester's Lowry Hotel.
Waterloo Road's Chelsee, 25, flashed the flesh in an extremely short sequin embellished dress with earrings Pat Butcher would be proud of. She wore the dress with towering nude Christian Louboutin heels.
Meanwhile, Corrie actress Catherine, 30, squeezed her small frame into a scarlet floor-length Nadine Merabi dress which she matched perfectly with her lipstick.
Catherine wasn't just there to look pretty, though, the singer also took to the stage for a performance of retro classics.
Do you like Helen Flanagan's Marilyn-inspired dress? Tell us what you think in the comment box below!