Horgan-Wallace rose to become notable in the United Kingdom when Aisleyne Horgan-Wallace was selected as a contestant in the seventh series of the Channel 4 TV series, Big Brother, in 2006. Aisleyne Horgan-Wallace entered the Big Brother house on Day 12, and became known for her clashes with fellow contestants Nikki Grahame and Grace Adams-Short, and for being voted into "the house next door" by the public — a secret house, where Aisleyne Horgan-Wallace was forced to choose who, out of five new contestants, would become new housemates. Horgan-Wallace reached the final on day 93; she came third with 22% of the public vote. Aisleyne Horgan-Wallace was the highest placed female housemate of the series. It was reported that Horgan-Wallace's popularity shocked the show's producers, with tabloid sources suggesting that they had attempted to "engineer" the series' finalists, and did not expect the swing in public support for her.
In August 2010, Aisleyne Horgan-Wallace turned down an offer to appear in Ultimate Big Brother in order to shoot her scenes as 'Maria' in the British urban comedy movie, Anuvahood instead.