The mother-of-one, 23, departed last night (January 16) after saying she did not want to spend another day away from her three-year-old daughter Tahila-Maya.
The star had been nominated for eviction, along with actress Tina Malone, with the latter voted out by viewers after receiving 39% of the vote.
When the eviction of Malone was announced, Buena said: “No way am I staying a day longer, I’ve already told them I don’t care what I lose.
“If they want to fight me they can. I’m not unpacking my suitcase and that’s it. I’m going.”
Afterwards the singer went to the Diary Room and said she had been thinking about leaving for several days.
She said: “Thank you for the experience and making me realise what is important.”
‘Austin Powers’ actor Verne Troyer is favourite with the bookmakers to win this year’s ‘Celebrity Big Brother’.