The group beelined it for a couple stores before boarding a tender that chugged its way to their floating palace ... the $250 million mega-yacht, "Tranquility."
TMZ broke the story ... Kylie & Co. boarded a private jet Tuesday filled with family and close friends to begin her big bday celebration. It's gonna be extravagant ... with a little help from the 29-person crew.
TMZ broke the story ... Kylie boarded the private jet with the train of what looks like a wedding dress poking out of the garment bag as it was dragged along the tarmac. It could have been fully covered up, but we're guessing it may have been a gag ... which Kylie often pulls. We're told they're not getting hitched on the trip.