Hunter Biden‘s former girlfriend ... would frequently use crack cocaine at prestigious hotels, including the Chateau Marmont in Los Angeles, in the months leading up to his 2018 gun purchase.

In 2017, she met Hunter Biden at Vivid Cabaret ... renting a bungalow for a month at the Chateau Marmont on the Sunset Strip. As per Kestan, that stay was a ‘highlight’ of their relationship ...

Hunter Biden fled last week to South Africa for a luxury vacation — with round-the-clock Secret Service protection — avoiding a grueling deposition scheduled for this week in a California lawsuit.