Bookies have the babe and her lover Jamie as favourite to take the £50,000 prize on Monday night.
They have leapt ahead of rivals Gabby and Marcel after a week of raunchy on-screen action.
And producers believe it is Camilla's "sexual awakening" that has gripped telly fans and swung the vote.
Prince Harry's ex, who swore at the beginning of the series she would never have sex on TV, has delighted Love Island bosses since touching down in Mallorca.
She has slowly shed her inhibitions and engaged in several X-rated romps with partner Jamie Jewitt.
This week she hinted to pal Gabby Allen that she had performed a sex act on the hunk.
Lying on the sunbed, the ex-beauty queen said: "I've been a bit naughty, if you know what I mean?"
She smirked and tapped her lips, adding: "I literally cannot resist him."
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Later in the beach hut, she said: "Jamie and I had a little bit of fun last night."
Previously Camilla had praised Jamie's "perfect penis" after they had sex.
Insiders believe she is now destined to win.
One said: "Reality television is all about the journey. Camilla embodies that.
"She's been a brilliant part of the programme and her sexual awakening is the star attraction.
"She's got a great chance of getting the cash."
Last night Gabby and Marcel Somerville enjoyed their final date of a helicopter ride over the island followed by a picnic.
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Once back at the mansion she broke down as she read messages written by her beau spelling out why he loves her, including her unique style.
Montana Brown and Alex Beattie had meanwhile enjoyed dinner on a float in the middle of the sea.
Alex swooned: "Meeting you is exactly what I needed, feeling emotions like I have done with you doesn't come very often at all."
And there was one more brutal twist last night as the contestants were told to take part in a secret vote for the couple they wanted to leave the island.
And tomorrow fans will get to decide who will leave the villa out of Alex and Montana, Jamie and Camilla plus Gabby and Marcel in one final vote-off.