Justin Bieber & Selena Gomez Makeout Mansion

Justin Bieber and Selena Gomez's death threat-inducing makeout session in the Caribbean last week took place in a GINORMOUS 9,000 square-foot mansion overlooking the ocean ... and we got pics!!!

Justin Bieber Mansion House
The Akasha villa in St. Lucia has more than a lot of Bieber history -- it's also got a giant pool with a swim-up outdoor kitchen, a huge game room, an elevator, 4,000 square feet of additional outdoor living space ... and a full staff including an on-call concierge.

It don't come cheap either -- place rents for $3,000 a night.