Kylie Jenner & Travis Scott's Triple Date with Biebers, Kendall & Devin Booker

Kylie Jenner and Travis Scott are showing signs that they're back together ... grabbing dinner at a celeb hot spot with famous friends and family.

Stormi's parents did a triple date night Sunday at West Hollywood hot spot, Catch LA, with Justin & Hailey Bieber and Kendall and her NBA star boyfriend, Devin Booker.

The 6-some all brought their own sense of fashion and style -- with JB still proudly rocking yet another new hairdo -- but Kylie was the only one who managed to duck the photogs all night. She's a pro!

We know she was there for the triple date, though, which only fuels speculation she's back together with Trav ... something that really kicked up a notch when she flew to Miami last weekend to celebrate his birthday with him.

You don't do fancy dinner dates with other happy couples unless you are feeling those same vibes yourself, right???