DJ Annie Mac has been holding a Free Music Monday series for a while now, and this week it was Ellie Goulding's turn to craft a mix. She's previously had James Blake, The Weeknd, and How To Dress Well contribute to the series and they've all been pretty great. However, Goulding decided to one-up basically everyone and debut a brand new track at the end of her mix: a collaboration with her ex-boyfriend Skrillex.

If you're worried about it being a bit too wobbly, don't fret! It's much more subdued and melodic than his solo efforts, and Goulding sounds downright sultry. Stream it below.