Cardi B Brings Offset on Grammys Stage, He Posts Vid of Kulture's Birth

2/11 8:25 AM PT -- More visual -- graphically visual at that -- evidence of the reunion ... Offset posted a promo video for his upcoming album, and it includes what looks like actual footage of Cardi giving birth to Kulture.

The punchline is a shot of Offset looking shell-shocked in a corner of the delivery room.

8:26 PM PT -- Cardi just won Best Rap Album -- beating out Mac Miller and others -- and she brought her hubby, Offset, onstage with her to accept her award. She even referred to him as her husband, and thanked him in what amounted to a hilariously sweet speech. Yeah ... they're back together, no doubt about it now.

It was certainly an emotional moment ... so much so, apparently, that somebody actually collapsed on the stage right after Cardi delivered her remarks.

A source at the show tells us the person who fainted was a female member of the pit area.

Cardi B and Offset are officially a red carpet couple again -- 'cause they just publicly reunited for the first time since their split last year.

The rappers showed up Sunday at Staples Center dressed to the nines -- especially Cardi, who was clearly paying tribute to designer Thierry Mugler's Fall 1995 collection. She wore a pink dress that looked more like a flower blooming with Cardi in the middle.

And, just to make sure we knew they were definitely back together, Cardi and Offset did this. Nothin' says we're a couple again like some good old-fashioned tongue.

Cardi and Offset were seen hanging out together at a club in Atlanta last weekend after apparently patching things up over the holidays, following a rocky 2018.

Looks like they're a lot closer to being all the way back now. Good for them.