Ariana Grande and Iggy Azalea are likely to score their first ever number one single in the UK this week with their hit collaboration 'Problem,' which is racing to the top of the charts thanks to a new sales policy which has been introduced.
The pop stars had better get the champagne on ice as the Official Charts Company reports that 'Problem' is holding off competition from former chart-topper 'Ghost,' by Ella Henderson, which has sold an additional 21,000 copies this week.

Ariana Grande and Iggy Azalea have struck gold as collaborators (STARPICZ/Splash News)
'Problem' has a combined chart sales figure of 55,000 copies so far, with 1% of that being attributed to streaming sites.
It is the first week that streaming figures contribute to a song's chart position, with services such as Spotify, Deezer, Napster and O2 Tracks, added to the final numbers.
Sia is a new entry at number three with her latest solo release 'Chandelier,' while Ed Sheeran's 'Sing' is at four and George Ezra's 'Budapest' rounds off the top five.
'Problem' is set to feature on Ariana's upcoming second album, which she recently announced will be titled 'My Everything,' while the next single from the record has been confirmed as 'Break Free.'
Revealing extra details for her excited fans, Ariana tweeted yesterday: "yes "only one" & "they don't understand" are on there as well! i'm so glad to see how excited u are for this album. makes me happy. love you."
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