These two are inseparable!

After getting matching broken heart tattoos with her pal Hailey Baldwin, Kendall Jenner and her 18-year-old pal jetted out of LAX to supposedly meet sister Kylie for more birthday celebrations in Mexico.

According to Us Weekly, Kylie caught a private jet to Mexico with boyfriend Tyga on Tuesday -- and it looks like Kendall is meeting them for a little vacay!

For the flight, Kendall donned a pair of grey culotte overalls, which she paired with white sneakers and a white shirt. Her sexy friend opted for ripped jeans and a ripped sweater.

Meanwhile, we were still a little shocked to see Kendall got some ink after the 19-year-old said she'd never get a tattoo after big sister, Kim Kardashian told her, “Don’t put a bumper sticker on a Bentley."

Yesterday, Hailey posted the picture of their markings on Snapchat with the caption "Hails n Kenny." We don't know what the significance of the broken hearts are -- but we bet we'll find out one day!