Billy Zane, Frances Fisher, Kate Winslet and Leonardo DiCaprio in "Titanic."

Story highlights

Zane posted a photo of the trio on Instagram with a joke about saving icebergs

It's been 20 years since 'Titanic' hit theaters

CNN  — 

Their hearts may have gone on, but the three stars of “Titanic” reunited for one night for a good cause.

Leonardo DiCaprio, Kate Winslet and Billy Zane were in St. Tropez on Wednesday for an annual gala hosted by DiCaprio’s environmental foundation.

Zane posted a photo of the trio on Instagram with a captioned that said, “Gangs back together. Now we’re saving icebergs. Go figure.”

That’s of course a riff on their 1997 hit film in which Zane portrayed the villain to Winslet and DiCaprio’s star crossed lovers.

In the movie, as in history, the RMS Titanic sunk in 1912 after it collided with an iceberg.

According to its site, the Leonardo DiCaprio Foundation was started in 1998 “with the mission of protecting the world’s last wild places.” This is the fourth year for the annual auction gala, which raises money for climate change research and environmental awareness efforts.

This year’s event included performances from A-listers Madonna and Lenny Kravitz.