The Hart to Hart actress received the fewest number of votes to save from the viewers ahead of Lorraine Chase.
Powers was up for eviction from the jungle alongside her fellow Orange Team campmates, who were defeated in the special immunity trial.
She was voted out of the show over Chase, Antony Cotton, Willie Carson, Sinitta and Fatima Whitbread.
"Thank you so much, that's fabulous," she said after hearing the results.
Speaking to Ant & Dec after leaving the jungle, Powers said that she was "happy" to be evicted, having helped to raise awareness for her lung cancer charity.
Asked about how she was able to remain so calm during tasks, she replied: "I'm not afraid of the bugs, they didn't bother me. I had looked at your show on YouTube, so I knew what was going to come."
Of her fellow campmate Sinitta's trial struggles, she added: "She's made tremendous strides, she actually sleeps without putting herself under her entire canopy."
All of the remaining campmates are now up for eviction from the jungle for tomorrow's (Friday's) public vote.
I'm a Celebrity continues tomorrow at 9pm on ITV1.
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