The 26-year-old was eliminated from the competition after losing the skate-off against television presenter Anthea Turner on Sunday night.
Lauren and her professional partner Michael Zenezini danced to Rescue Me by Fontella Bass, while Anthea and partner Andy Buchanan skated to Minnie Ripperton's classic Lovin' You.
The panel unanimously voted to save the TV presenter.
"I'm saving someone who was really committed out there," explained judge Ashley Roberts.
One of you was elegant, beautiful and committed. The other one - the only way is through the back door. I'm saving Anthea.
Lauren was second from bottom following the judges' votes after initially dancing to Alicia Keys' Girl on Fire.
Judge Jason Gardiner told her the beginning of her first routine had "all the sensuality of a walrus on ice".
Head judge Robin Cousins was more sympathetic, telling her: "You have to be more confident in your own abilities and not necessarily just rely on Michael. I felt you did what you had to do, it was adequate, but you need to own it."
Afterwards a disappointed Lauren said: "Obviously I'm gutted, but I'm ok. I've enjoyed it. I've met some amazing people that I'm always going to keep friends with now. It's been a great experience and I've had fun."
Ex-Welsh rugby player Gareth Thomas topped the judges' leaderboard after dancing to Killers' track All These Things That I've Done with partner Robin Johnstone.
Judge Karen Barber commented: "It was a very powerful track and you performed it powerfully. The skating content was fantastic."
Jason added: "I was expecting you to be a disaster, really, given that you're a rugby player.
"What I did get was somebody that was moving very confidently on the ice. You actually had really good speed."