The track, which was unveiled today, is said to have ripped off the song 'Penguin' by Avicii - an up-and-coming Swedish DJ better known under his UK guise Tim Berg.
The song's production is instead credited to Sandy Vee, who is best known for working on Rihanna's 'Only Girl (in the World)', David Guetta's 'Where Them Girls At' and Alexis Jordan's 'Good Girl'.
"Ministry of Sound signed Avicii a year ago and have been working on vocal ideas for over six months on the track," a source close to Ministry of Sound said.
"Pete Tong, Annie Mac and Scott Mills have been playing 'Penguin' for months now, but this week we've realised Simon Cowell and Leona Lewis have stolen our record. 'Collide' is identical to Avicii's track!"
Avicii, who is signed to the independent Ministry of Sound label alongside the likes of Example, Wretch 32 and Yasmin, is best known for his club hit 'Seek Bromance', which entered the top 20 last year.
Lewis recently said that she was excited for people to see a different side to her music, adding: "For me this song has all the great ingredients of a summer anthem."
Listen to Leona Lewis's 'Collide' below:
Listen to Avicii's 'Penguin' demo below: