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Wednesday night's episode saw 28-year-old Arabella, who is a model from London, strut her way onto the show much to the surprise of the other Islanders, before hopping straight onto a sun lounger.
But it was Curtis' reaction which had people talking, as he was seen whipping of his cap and sunglasses, gasping: "Holly hell," in a moment reminiscent of Dr Alex George last year.
This reaction from #Curtis when he saw the new girl actually made me laugh out loud :joy::joy:#LoveIsland #Loveisland2019 #LoveIslandUK pic.twitter.com/CwkOfjA9Je
- Elaine - Love Island Fan :heart::palm_tree::couplekiss::bikini::tropical_drink: (@lanie_IslandFan) June 19, 2019
Fans are now convinced that the two Islanders already know one another or could even be exes as Love Island producers aren't afraid of throwing a former partner into the villa to shake things up.
Last year, Jack Fincham and Dani Dyer's coupling was rocked by the arrival of Ellie Jones, who the former stationery salesman dated.
Love Island viewers flocked to Twitter to speculate over Curtis and Arabella's 'link'.
"Arabella is definitely one of Curtis' exes and I am LIVING for the potential sh*tstorm," exclaimed one person.
Another added: "Everyone in the UK scrolling through the new girl Arabella's photos to find out if there's a relation between her and Curtis.
"They love to throw an ex girlfriend into the villa don't they. Poor Curtis!" tweeted somebody else.
Curtis' reaction to the new girl is EVERRYHTINGGG :joy::joy::joy: #loveisland
- Amina (@aminahh_k) June 19, 2019
The new girl in the villa is defo going to be someone from Curtis' past
- horny princess x (@AoifeBarrett3) June 19, 2019
OMG rumor has it the new girl is CURTIS' EX!!!!! #Loveisland
- Mike :fog::boom::dragon_face::dragon: (@Mike_Joseph_) June 20, 2019
WHY DID CURTIS MAKE THAT FACE AT THE NEW GIRL SJDNDJD CMON DRAMA!
- ENGAGED!JAFAEL STAN (@irissknowles) June 20, 2019
Curtis has been coupled up with Amy Hart from day dot, with the pair even confirming that they are now "half" boyfriend and girlfriend.
However, some believe that his reaction means the professional dancer's "head has been turned" by Arabella.
"Judging by his reaction, Curtis either knows the new girl or his head has been turned," posted one fan, while another noticed Arabella is following Curtis on Instagram.
"Well 'new girl' is following Curtis...soooo....let the dramas unfold," they wrote.
Curtis was in a relationship with fellow professional dancer Emily Barker for two years shortly before entering the villa.
Hopefully the reasons behind Curtis reaction will be explained tonight!
Love Island continues on ITV2 tonight at 9pm.
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