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Leonardo DiCaprio, Paris Hilton

Paul Archuleta/FilmMagic/Karwai Tang/WireImage

Leonardo DiCaprio is a mama's boy!

The Oscar nominee dropped more than $13,000 on a Chanel purse for his mom while attending the Heart Fund Gala in Cannes. A blue Neoprene flap bag with embroidered flowers, the purse was sold as part of an auction to benefit the charity. Leo told reporters that he purchased the accessory for his mom.

Cue the awwws.

But the Inception star, 40, didn't win it too easily. He was in a bidding war against Paris Hilton, 34, who was just as anxious to take home the bag as he was. Even though she didn't win the coveted bag, she didn't play the role of a sore loser. A source told People that both she and Leo were enthusiastic members of the auction all night long.

"Paris was great. She bid on many things, and Leo did too," the source said. "Both her and Leo were so active during the entire auction. It was really nice to see."

Leonardo DiCaprio, Irmelin Indenbirken

Jeff Vespa/WireImage

It seems that the Wolf of Wall Street actor peaked with his Chanel purchase, as he lost out on two other items, including a vacation at one of the luxury resorts of Nikki Beach Worldwide. Other celebs such as Gary Dourdan and hip-hop artist Mos Def also attended the event. Mos Def even put on a performance for the crowd!

The Heart Fund offers cardiovascular care across the globe for impoverished children. Heart surgeons have donated their services to perform the operations that are incredibly costly. Last year, with the support of Nikki Beach owners Jack and Lucia Penrod, the organization purchased a bus to act as a mobile hospital to screen and treat children, which was unveiled at Monday's gala.

This year's goal was to purchase a plane outfitted with medical equipment to perform surgeries, which the foundation was able to achieve as one benefactor reportedly donated around 6.8 million.

Although the celebs are enjoying life in Cannes for the famous film festival, it will be back to work soon enough...even for Leo! He is busy filming Alejandro González Iñárritu's The Revenant, which follows Hugh Glass, a frontiersman who sets out for revenge on those who left him dead after he was mauled by a bear.