Usher Serenades Saweetie at Vegas Residency Show

Usher is back to his smooth, serenading ways -- only this time, it's Saweetie who was in his sights ... and fortunately for everyone, her significant other doesn't seem to be trippin'.

The singer was doing yet another show at his Vegas residency Friday -- where none other than Saweetie showed up to see the man in action. Welp, like he's done with other stars in the recent past ... Usher honed in on her and started belting out slow jams right to her face.

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Not the song, mind you -- he was actually crooning his hit, "There Goes My Baby," and was seeking a little assist from Saweetie ... who did help him, albeit somewhat off-key. 😅

It proved to be a sweet and funny moment, no doubt ... and Saweetie certainly seemed to be in on the fun. Of course, what everyone almost immediately thought of when seeing this was the whole Keke Palmer debacle -- where her man lost his s*** over her doing the same.

You'll recall ... Darius Jackson -- with whom Keke shares a child -- publicly aired out his grievances about Keke getting special a little treatment from Usher this past week.

His main gripe, it seems, was more so about her outfit ... which he apparently thought was a little too revealing, and which he made known by reminding her that she was a mother now.

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