The pair look engrossed in a conversation on FaceTime, leading to speculation that they were having a catch up with Ant McPartlin.
He's taking a break from the ITV show this year following his drink-drive crash – leaving Holly, 37, to step into his shoes.
Photographs from today show Dec and Holly looking happy and relaxed as she chatted to the person on the other end of the phone, with her co-host hovering over her shoulder.
He smiled at the camera as the pair stepped away from their friends to take the call.
Holly was later seen throwing her head back with laughter during the lunch as she ate alfresco in Australia.
Earlier in the day she suffered a tumble while filming I'm A Celeb's terrifying helicopter scenes with Dec.
The host fell to her feet after arriving to Springbrook National Park in Queensland by helicopter, which left her and her co-host in a fit of giggles.
This morning a new trailer for Sunday's show was released showing her squealing with excitement as she joins Dec on set.
Looking jungle ready, Holly is seen wearing a snake print miniskirt with a T-shirt featuring a cobra design.
In the clip which will air tonight, Dec says: “The wait is almost over and the adventure of a lifetime is about to begin for ten familiar faces, I mean 11 familiar faces. You are in the jungle!”
Squealing, Holly replies: “I know, how did I get here? Help me! It's so exciting!"
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