Indie pop star White Hinterland has accused the pair of sampling her song Ring the Bell without her permission, and then refused to acknowledge her when she attempted to right the wrong in a meeting.
She filed a lawsuit earlier this week (beg23May16), prompting Skrillex to assure his fans and followers that he's not in the habit of stealing from other people's songs.
On Friday (27May16) he hit Twitter and showed his followers how he and his songwriting partners created the loop White Hinterland, real name Casey Dienel, claims was nabbed from her record.
In a video posted to the microblogging site, Skrillex pulled up the original a cappella from the Sorry sessions and revealed how he cut co-writer Julia Michaels' vocals to create the section they have been accused of ripping off.
"SORRY but we didnt (sic) steal this," he wrote.
However, Bieber and Skrillex's producer pal Diplo fears the odd couple could still be in hot water, because the sample sounds so similar to sections of Ring My Bell.
The producer, who worked with Bieber and Skrillex on the song What Do You Mean, is convinced the matter was little more than oversight - but it could cost his friends a big payday.
He told TMZ, "I thought they sampled it, I thought they cleared it. It's pretty easy... It must have been an oversight
"There's more producers... maybe, like, 10 writers altogether (who worked on the track). Somebody added it without telling anybody... They should have fact checked it."
Diplo admits he fell foul of the same copyright issue when he was recording All Night with Beyonce, explaining, "Somebody added horns and I noticed they sounded like SpottieOttieDopaliscious by Outkast and I told them. Then we had to give Outkast 25 per cent of the record, which sucks, but everybody got paid."