The pair was staying at a hotel in the Latin American paradise when things started to go missing from their room.
Simpson explains, "We'd go to sleep and we'd wake up, and the maid wasn't even here, but sunglasses, my Sony, my favourite Wireseal hat, all this stuff, my favourite make-up bag (was gone).
"We were like, 'Where is everything?' We asked the hotel and they said that the monkeys like shiny things.
"That monkey has some serious designer clothes."
Source: WENN