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'Milliam' beat Toby Aromolaran and Chloe Burrows, Faye Winter and Teddy Soares and Kaz Kamwi and Tyler Cruickshank to the £50,000 prize fund.
When host Laura Whitmore prompted them to choose between two cards and Millie selected the card with all the prize money, the couple decided to split it equally between them. Aww!
But as viewers sat on the edge of their seats waiting for Millie's decision, fans of Who Wants To Be a Millionaire thought the background music sounded like the music on the long-running ITV gameshow.
Watch the clip below:
"Why does it sound like I’m watching who wants to be a millionaire instead of love island final," one fan tweeted during the final.
Another viewer quipped: "What's with the dramatic Who Wants To Be A Millionaire music."
While a third person said: "wow they’re really pulling out all the stops for the #LoveIsland final, using the Who Wants To Be A Millionaire tension music."
A fourth shared: "Why does the music on love island when she’s waiting to announce the next placing sound like the music on who wants to be a millionaire when they need to decide between phone a friend or ask the audience."
This isn't the first time Love Island fans have been reminded of other shows thanks to music. During Kaz Kamwi and Tyler Cruickshank's final date at a beautiful courtyard, complete with live music - which fans instantly recognised from the hit Netflix drama Bridgerton.
The classical musicians played an extra special orchestral rendition of Taylor Swift's song 'Wildest Dreams' which was also used in Bridgerton.
Love Island fans notice everything!
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