The Towie star, 29, mingled with fans in the sun at BH Mallorca.
Pete lost three stone during a gruelling stint on Bear Grylls' Celebrity Island.
He spent five weeks "starving" and is struggling to put the weight back on.
Pete exclusively told The Sun Online: "You think you're going to be able to come back and scoff as much as you want, but you physically can't.
"I've been really struggling ever since. It's the hardest thing I've ever done, without a doubt."
He added: "It's not like Big Brother when you're sat around not doing anything every day.
"We had to do everything – find food, search for water and collect wood – or else we wouldn't survive.
"It was tough."
But he kept schtum about how far he managed to go on the show.
Pete laughed: "Well, I'm here aren't I, so I survived it."
Gushing about girlfriend Shelby, he said: "It's nice for me to back and have Shelby there waiting for me.
"It was a tough time to be away, so early on in our relationship, but we're stronger than ever and happy as larry."
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