The 'Valentine's Day' actress was glad she scaled Africa's highest peak, but the physical challenge left her "miserable". She said: "I'm never going to that again. I just got back six days ago. It was incredible. "It was such a challenge for me. It was probably one of the hardest things I've ever done... sometimes it was kind of miserable.
"Altitude sickness is like a general uncomfortable, uneasy feeling. You just can't think straight."However, the 27-year-old actress has suggested everyone should undertake a huge challenge like the one she completed at least once.

She added to Access Hollywood: "Hiking for seven hours a day and sleeping in tents and being out in the wilderness was a real experience everyone should try."Jessica undertook the trek up the mountain to raise global awareness of the world's water crisis alongside actor Emile Hirsch and other philanthropists including Kick Kennedy - granddaughter of Robert F. Kennedy and executive of the UN Foundation Elizabeth Gore.