The "Dream Team" trio was apparently up late in the studio on Tuesday night ... sharing several pics of themselves with huge grins, a good sign the tunes are turning out right.
Nelly dialed in remotely from FaceTime while Timbaland and Justin were together in-studio ... but the reunion was still full circle.
Back in 2006, Timbaland oversaw the production of both JT and Nelly's blockbuster albums ... "FutureSex/LoveSounds" and "Loose" ... with both projects selling millions of records, opening the door for more collabs as the artists owned the dance floors for years.
The upcoming collab is a swift 180° from Timbaland's reckoning that technology was taking over the music industry for good the last time he appeared on TMZ Live ... which will surely appease fans fearful of the AI apocalypse!!!