The pair tied the knot at the five-star Cashel Palace Hotel on Friday, September 18 in front of family and friends.
Guests were treated to music from Riff Shop Music, famous for their high-energy drums and saxophone sets at the stunning wedding reception.
Gemma is the daughter of MEP Barry Cowen and his wife Mary and a niece of former Taoiseach, Brian Cowen.
Wedding photographer Christina Brosnan shared the first images of the newlyweds on Gemma’s Instagram page on Saturday.

13. William O' Donoghue and Gemma Cowen wedding
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14. William O' Donoghue and Gemma Cowen wedding
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15. William O' Donoghue and Gemma Cowen wedding
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