They generally don't share photos together (except one on Snapchat awhile ago), so this is kind of a big deal. Did they just make it IG official? Not necessarily, but it's significant given that they literally never post pics together.
Sometimes, eagle-eyed fans have spotted the same background in their IG photos or Snapchats and speculated that they were together, but this time, none of that is necessary because there they are in their coordinating and everything.
Of course, Kylie and Tyga didn't just take the trip together. Kylie's sister Kendall is also there and they shared some fun snaps on the photo sharing site, too.
Looks like everyone is having a great time!