In 2008, Noonan participated as Miss Meath in the Miss Ireland pageant alongside thirty-seven other contestants at the Crowne Plaza Hotel Santry in Dublin, where judges included music manager Louis Walsh, actor Matt Di Angelo, and former Miss Ireland Pamela Flood. Noonan emerged the winner.
Noonan, who has appeared in several plays and short films including Wedding Bed, Loves Me Not and First Date all directed by Eoin Maher and Produced by Lisa McNamee.She cites Halle Berry as her role model, and future plans include opening a school in Ireland, where she intends to teach Drama, and becoming an actress. As Miss Ireland 2008, Noonan's prizes included €10,000 in cash and the use of a Hyundai car. In addition, Noonan represented the Republic of Ireland at Miss World 2008, where she made the top ten in Miss World Talent. She is represented by Compton Model Agency and was the face of Lipsey’s Autumn/Winter 2008 collection. She has also modelled for the Gillian Hughes hat collection.
In 2009, Noonan told the Sunday Mirror that she would welcome any offers to pose nude, provided it was tastefully done. She claimed "I'm not prudish, but I have a lot of respect for myself."
In 2009, Noonan told the Sunday Mirror that she would welcome any offers to pose nude, provided it was tastefully done. She claimed "I'm not prudish, but I have a lot of respect for myself."