US singer-songwriter Ariana Grande topped Britain's singles chart on Sunday with her track "Problem" featuring Iggy Azalea, becoming the first performer to head a new look chart based on Internet streaming as well as physical sales data.
The Official Charts Company said the 21-year-old singer had made history in the process, notching up a combined charts sales figure of 113,000 in the last week.
That was made up of 106,000 physical sales and 712,000 audio streams, it said, saying it counted 100 streams as a single purchase.
"Ghost", a track by former TV talent show contestant Ella Henderson, held onto the second spot, it said.
In the albums chart, British singer/songwriter Ed Sheeran held onto the top spot for a second week with his album "X", which is pronounced as "Multiply".
A self-titled album by 5 Seconds of Summer took the second spot, while an album by George Ezra, "Wanted on Voyage", placed third.