11:37 AM PT -- A source close to Gaga tells us the singer is furious the song is still on the Google service. We're told she was under the impression everything had been taken down, and this one, somehow, slipped through the cracks. Her team blames Google's switch of most of its music operations to YouTube for the lapse as Play dramatically cut staff.

10:35 AM PT -- IGA tells TMZ, "We are working on taking this down now."

Lady Gaga hasn't completely followed through on her promise to remove her song with R. Kelly from streaming platforms, because their collab is still available for purchase on Google Play Music.

As of this post, you can still throw down $1.29 to buy Lady Gaga's song, "Do What U Want (With My Body)" featuring R. Kelly.

Gaga said 6 days ago she was pulling the collab from iTunes and other streaming services as an act of solidarity with the women Kelly allegedly abused.

It HAS been disabled on iTunes, Spotify and YouTube. It's unclear if Google Play was overlooked, or if the purge just hasn't gotten to the platform yet.

As you know, Celine Dion, Ciara, Chance the Rapper and the Pussycat Dolls followed in Gaga's footsteps and pulled or are in the process of pulling their collabs with R. Kelly in the wake of Lifetime's docuseries, "Surviving R. Kelly." Still, it's interesting that Gaga and Kelly's song hasn't been completely scrubbed.

We've reached out to Google and Gaga ... so far, no word back.