Avicii, who saw his track 'Wake Me Up' reach No. 4 on the Billboard Hot 100 last year, had simply tweeted 'Studiomode!' several hours earlier.
There's been no word on what exactly the pair worked on last night, or whether the sessions were intended for a future Avicii release or Madonna's next album. In February, she confirmed to The Canadian Press that she was working on the follow up to 2012's 'MDNA,' saying 'Plans are in the works already. Don't ask me with who, it's a secret. Top secret.'
Madonna's affinity for Avicii is well known. She famously popped up as a surprise guest during the Swedish DJ's set at the Ultra Music Festival in 2012.