The Assets beauty will trade-in her stilettos for hiking boots as she sets out on a trek to Peru's Machu Picchu for charity on Sunday.
Jenny-Lee will join a host of big names including Boyzone's Mikey Graham on the week-long challenge to raise funds for Keith Duffy's charity, Autism Action.
Jenny-Lee said her only worry is that she will suffer the same fate as Cheryl, who fell victim to altitude sickness while climbing Mount Kilimanjaro for charity last year.
She said: "I think I can make it to the top. I'm just worried the altitude might affect me, like Cheryl Cole.
"With my modelling work I would always be in the gym but I've been doing a bit extra to get the legs strong.
"I've been doing weight training and cardio and trying to eat healthily."
The leggy blonde said she has been a long-time admirer of Keith Duffy's work to raise awareness of autism in Ireland.
She said: "There's a few people I know going like Niall McCrudden, Michael Wright, Mikey Graham and, of course, Keith."