'Kinky' ex-Corry actress gets tangoed on Strictly Come Dancing
Clad in a rubber catsuit, she was likened to a "gothic version of Olivia Newton John" by judge Craig Revel Horwood.
The judges' scores left O'Brien and fellow actress Felicity Kendal at the bottom of the leaderboard.
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Hide AdBut the combination of the judges' scores and viewer votes meant O'Brien and partner Jared Murillo were eliminated from the competition.
Her technical performance on Saturday night's show received a mixed response from the panel.
Bruno Tonioli gushed: "You kinky kitten, you go very well with rubber, I can see you in rubber all the time! The most focused performance of the day, very vampish. However, it needs more drive on the walks of the tango, you need to use your feet on those hooks."
Revel Horwood said: "It was a bit stoppy and a bit starty. I actually was just a little bit bored throughout it."