However, despite their solid friendship, it's rare to see the dynamic duo spend time with the rest of the Titanic alumn. This made last night's events all the more exciting, as Leo and Kate reunited with their arch nemesis Caledon Hockley, we mean Billy Zane.
The gang reunited in St. Tropez, France, to raise money for the Leonardo DiCaprio Foundation, which advocates and raises money for environmental protection.
Zane took to Instagram to share a sweet photo of their group, joking in the caption: "Gangs back together. Now we're saving icebergs. Go figure.."
The evening featured several interesting auction options, including a chance for one lucky (and very rich) human being to dine with Leo and Kate in the restaurant of their choice in New York City.
Zane also contributed to the evening, giving a painting to the foundation that was later auctioned off for €100,000.
Our favourite stars reunited and worked together to save the environment?! A win-win for us all!