The supermodel and Latin pop star were on the list for Jay-Z and Beyonce's Oscars after-party Sunday in L.A., and while it's unclear if they showed up as a unit ... they certainly left as one, getting into the same car at the end of the night.

Check it out for yourself ... the new couple slipped into the same waiting town car. They still managed to dodge photogs trying to get them in the same frame. Clearly, they're still trying to keep it on the DL, but failing more with each date night.

Kendall was covering her face as they drove off ... BB seemed a little more casual about it all. Fact is, we've seen them together already, and everyone knows what's going on.

Remember, we just saw Kendall and Bunny on a group date last week ... where they hit up a celeb hot spot in West Hollywood. They were caught on camera embracing each other as everyone parted ways.

Anyway, just further proof these 2 are the real deal and currently seeing each other ... on a somewhat serious level, at the very least.

Oh, and take a gander at all the other celebs who were at Bey and Jay's blowout. We'd say it's a who's-who -- but, frankly, the pie was split pretty evenly throughout the weekend. With that said, there was some talent on hand ... Bieber, RiRi, Tyler, just to name a few.