She has said for weeks that if she was not evicted she would walk out of the house and this morning she did.
Rising early as the housemates were woken to the sound of the Clash's 'Should I Stay or Should I Go', she packed her bags.
On Friday night, Orlaith saw off Kemal in another close run vote. The previous week she had beaten Leeds rapper Science in an equally close contest.
The 26-year-old Belfast model will be best remembered for her time in the house for flashing her surgically enhanced breasts at every opportunity.
She blamed her departure on gay Tory speech writer Derek. "I couldn't stand being in the house another week with him," she said.
Her departure leaves five contestants to battle it out in the last two weeks of the longest-running 'Big Brother' to date.
Orlaith had been one of surprise contestants introduced into the house four weeks after the series started.
The model entered with fellow contestant Eugene best known for... well, making no contribution or impression whatsoever.
On Friday night after being evicted, Kemal told 'Big Brother' presenter Davina McCall: "She [Orlaith ] should be sat here. I felt like opening the back door and kicking that girlfriend out myself. She's such a liar."
Before leaving, Orlaith said: "I know I'm doing the right thing, I can feel it."
However, Eugene and Derek remained by the pool refusing to come in. "Tell her to go, for God's sake," Derek said as Big Brother announced that Orlaith would leave in five minutes.
On Friday, Orlaith and the other housemates had concocted a story to tell Derek and Eugene that she was the mole working for 'Big Brother'.
"You guys tell them the reason why I'm leaving, that I was working for Big Brother," Orlaith told Makosi, Anthony and Craig.
There had been speculation since the start of the sixth series that there was a mole inside the house.
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