The 26-year-old "Beneath Your Beautiful" hitmaker proposed to his partner Muz whilst on stage at V Festival at Hylands Park in Chelmsford, reported the Daily Mirror.
"He talked about loyalty before proposing and how his girlfriend had been with him since the start of his career and stood by him," a source said.
Apparently, when she said 'yes', the crowd cheered and applauded.
Fans have also offered their congratulations to the couple on social media.
One wrote, "Congratulations to @Labrinthda1st and @its_Muzzy on getting engaged! x (sic)"
While another said, "Congratulations @Labrinth on your engagement!! #VFestival #TweetTheFest (sic)"
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