And while loads of fans took to social media to celebrate the couple, someone that didn't look so happy was Lillie Haynes, who Liam met during his time in Casa Amor.
In case you need a refresher, Liam and Lillie kissed and shared a bed during his three days away from the main villa, and Lillie said she was "shocked" that he hadn't chosen to take her back with him.
Following a drama-filled chat between Millie and Lillie, Millie admitted it would take a lot for Liam to win her back. Fast forward 10 days, the L-bomb and making things official, the pair won Love Island with 40% of the final votes.
So how did Lillie react? Er, judging by a video shared on social media, she wasn't hugely happy about the whole thing. A viral clip shows the 22-year-old trainee accountant recording the live final on her phone, before turning around disappointed when Liam and Millie were announced.
Speaking to The Sun after her exit, Lillie said, "When I found out Liam hadn’t chosen me, I felt misled. He’d been giving me what I wanted to hear and I was convinced he was the one.
"He made me feel as if I had a really strong chance of going back to the villa with him. He was very hands-on — we were like a couple in there. So I definitely thought I was going to get picked. When he chose to go back alone, I was shocked."
Here's to hoping all three of them get their happy ending.
Watch: Love Island 2021 winners Millie and Liam return to UK
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