Appearing alongside This Morning presenter Alison Hammond, 44, from inside the villa grounds, Caroline spilled all on the secret.
Alison asked the host: “What secrets can you tell me? Is there any nuggets you can tell me about the Love Island this year?”
Pausing for a brief moment, Caroline collected her thoughts before replying: “In the hideaway this year, there’s a secret compartment, but they [contestants] won’t know.
“They just have to find it,” the presenter teased, with Alison in shock at the tantalising news.
Eager to find out more, Alison asked: “What’s in the compartment?” to which Caroline joked: “Dunno,” as the pair burst into laughter.
Caroline did continue, adding: “ I think there’s some sort of treats. Sexy treats,” before she and Alison discussed any other changes to the villa.
The source continued: “If they are both interested in the same man it will be very interesting viewing, as both of these girls are very driven and will go after what they want.
“Neither of them is afraid to use tactics to get what they want. There are guaranteed to be fireworks between these two.”
Five years after it was revamped, the series has gained a huge fan base and producers are sure to be planning big things to ensure viewers it was worth the wait for the ITV reality show to return.
Could this include the arrival of Coronation Street star Colson Smith, 20, who plays loveable Craig Tinker on the ITV soap into the villa?
Colson spoke about taking part in Love Island on the British Soap Awards, in an Instagram video with his co-star, Lucy Fallon, 23.
Love Island returns tomorrow night at 9pm on ITV2.