Leonardo DiCaprio and Kate Winslet reunited on July 26 at The Leonardo DiCaprio Foundation's annual fundraising gala, and the Titanic stars were joined by their co-star, and on-screen nemesis, Billy Zane. The 51-year-old star snapped a celebratory pic with his old pals and marveled at the irony of the trio reuniting at an event trying to raise money to protect the environment from global warming. "Gangs back together. Now we're saving icebergs. Go figure," Zane joked in the caption.