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Published 15:10 29 Nov 2017 GMT

Viewers have been picking up on it.
https://twitter.com/Mufz11/status/935629738449784834?ref_src=twsrc%5Etfw&ref_url=https%3A%2F%2Fwww.her.ie%2Fentertainment%2Fdennis-wise-secretly-communicating-family-im-celeb-377172
https://twitter.com/Lubii_lubna/status/935267017007001601?ref_src=twsrc%5Etfw&ref_url=https%3A%2F%2Fwww.her.ie%2Fentertainment%2Fdennis-wise-secretly-communicating-family-im-celeb-377172
https://twitter.com/NottsPhil/status/935629719105622016?ref_src=twsrc%5Etfw&ref_url=https%3A%2F%2Fwww.her.ie%2Fentertainment%2Fdennis-wise-secretly-communicating-family-im-celeb-377172
https://twitter.com/Eilirhughes1/status/935629667909988352?ref_src=twsrc%5Etfw&ref_url=https%3A%2F%2Fwww.her.ie%2Fentertainment%2Fdennis-wise-secretly-communicating-family-im-celeb-377172
He isn't the only one doing it either. Rebekah has managed to write messages on her hat using charcoal to communicate with her family.

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