Noirin, who was born in Dublin. She has five brothers and one sister. Kelly was an all-Ireland athletics champion in 100 and 200 metres, and ran for Ireland three times. Her father was an Irish missionary priest, who met her mother in Kenya.

This beautiful girl acted as midwife when she delivered her baby brother.

Before going into Big Brother Noirin had claimed to have kissed Russell Brand whilst she was dressed as a bunny.

Noirin Kelly was a 25-year-old single retail manager from Dublin when she entered the Big Brother house. Girl became the first actual female housemate in Big Brother 10 when she and Rodrigo passed a task on the first night. She and Karly along with rule-breakers Siavash and Sophie (Dogface) were up to be the sixth full housemate to be evicted from Big Brother 10. But, Noirin survived the public vote with Karly getting evicted.

On day 48 of Big Brother, Noirin Kelly along with ten other housemates found herself up for eviction after a failed task by new housemates and a rule break by most of the old housemates, however as Kenny walked out of the house, the eviction was cancelled.

On day 55 of Big Brother, Noirin was nominated alongside Marcus. Noirin was evicted after losing the public vote. It had only been days before that her ex-boyfriend Isaac Stout had entered the Big Brother house.

On the day that Kelly was evicted, Isaac walked out of Big Brother to join her.

Big Brother was not the first reality TV show, Noirin Kelly had been on. In 2007, Noirin was on MTV's Real World Sydney.