Ireland's top model has been nominated for the top gong every year for the last 13 years and finally broke the curse tonight.
Fitzgerald was also her date for the evening. Rosanna thanked her designer pal for keeping her in style over the years.
Most Stylish Man went to MMA fighter Conor McGregor, who was over the moon with the nod. Wearing a checkered suit, he ran to the stage to accept his award. McGregor beat out favourite Aengus Mac Grianna to the title.
TV3's Leanne Moore won Best Newcomer, while Lucy Kennedy won Look of the Year.
The mum of three stunned in an embellished Rachel Gilbert gown, showing off her svelte physique.
And the typically down to earth tv star joked about her weight with fellow super stylish mum Michelle Heaton.
Other style stars included Mairead Farrell in pink colour block, Lorraine Keane in Marion Murphy Cooney and the eternally stylish Celia Holman Lee in Escada.
Celia won the first ever Stylish Woman award 13 years ago and has never missed a ceremony since. She joked that she will be 'rolled into the awards' for years to come.