It is Derulo's fifth song to top the UK chart and Jawsh 685's first (of hopefully many).
"Being a youngin from South Auckland hitting the charts heavy to the point where we hit Number 1! Honestly it is just the biggest blessing I could have ever received, seeing it happen to not only me but for my family and friends," the teen told OfficialCharts.com.
Jawsh 685 is also the first Pasifika artist to ever top the singles chart in the UK.
He took to Instagram to share the news with his followers.
"yo we did it ! cracked #1 in the UK and NZ ! for the track " Savage love " with @jasonderulo," he wrote, before giving a shoutout to "everyone for the support 24/7".
"Always all glory to God," he added.
Only two other New Zealanders had previously reached that milestone in the UK: Kimbra, in her collaboration with Gotye, "Somebody that I used to know" in 2012, and Lorde with "Royals" in 2013.
"Savage Love" is currently No 1 in New Zealand and Australia.