...and Hailey Baldwin, who celebrated her 18th birthday in Los Angeles last night!

Justin Bieber was reportedly on a spiritual retreat in the desert just last week, but after leaving early and heading back to Hollywood, it looks like he was ready to trade in the Bible for bottle service. Kendall and Kylie Jenner posted tons of Instagram pics of the group, and they were also celebrating pal Khalil's 20th birthday at an undisclosed location.

While Selena Gomez has been lamenting over her split from the Biebs with her new music, rumor has it he's trying to win her back, and he reportedly has something planned for the American Music Awards tomorrow night. While this seems a little bit hokey, Kendall recently spoke out and said there was absolutely nothing going on with her and the bad boy pop superstar, and just a few weeks ago, Selena chatted on Ryan Seacrest's radio show and stated that she and Kendall “were never not friends.”

So what should we take from all this? Just because Selena wasn't invited to Hailey's bday bash doesn't mean there might not be a Jelena reunion! But Hailey is kinda hanging all over Bieber in the shot above, so that's not giving us much hope. But ... never say never!

Earlier in the day, leggy ladies Kendall and Hailey went shopping at Barneys New York in Beverly Hills ... click the gallery below for pics of that!