Ariana Grande and Justin Bieber have defended themselves after rapper Tekashi 6ix9ine accused them of buying the number one spot on the US chart.
The rapper claimed the pop stars had bought tens of thousands of copies of their charity duet Stuck With U to boost its position.
He also said some streams of his song Gooba were improperly discounted, leaving it in third place on the chart.
Grande, Bieber and chart compilers Billboard have all denied the claims.
Bieber called the rapper's accusations "a lie", while Grande advised him to "take a moment to humble yourself".
Billboard, which publishes the US charts, posted a lengthy article refuting each of his points while explaining how positions were calculated.
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