Leonardo DiCaprio and Kate Winslet

How much would you pay to have a private dinner with Leonardo DiCaprio and Kate Winslet? Well, first you'd have to be Invited to the gala he's hosting Wednesday night in St. Tropez, France and be able to outbid all the deep-pocked guests, including Madonna. So that narrows down your chances a tad.

Dinner with the "Titanic" co-stars is one of the top auction prizes at the event being held July 26 to raise money for the Leonardo DiCaprio Foundation.

The top bidder will also be choosing where the dinner happens. But that also comes with limitations, according to MSN: The restaurant will have to be in New York City and the meal will have to take place in either October or November because of the Oscar winners' busy schedules.

The money raised by the auction will go, in large part, to environmental causes supported by Leo's foundation. According to People, causes supported by Kate include a GoFundMe campaign that is helping a young British mother pay for cancer treatment and her Golden Hat Foundation, which benefits children with autism and their families.

Lenny Kravitz will be performing at the star-studded event and guests will include Madonna, Cate Blanchett, Emma Stone, Tom Hanks, Jared Leto, Kate Hudson and Penelope Cruz. Which means another star is likely to be the one dining with Leo and Kate!

[Via MSN, People]