It was a fashion face-off today between Bella Hadid's sexy see-through Roberto Cavalli dress and Kendall Jenner's risk-taking look of denim cut-offs paired with an extravagant blouse with a train!

Kendall's fancy black asymmetrical crop top is from Alexandre Vauthier's spring 2017 collection, as are their crystal waistband denim shorts. Later in the evening, Kendall removed the train, leaving a simple bustier -- a lot easier to maneuver in.

The lovely ladies were in attendance for Fashion For Relief founder Naomi Campbell's launch of Diesel's Child At Heart collection to raise money for charity. Inside the event, the girls walked the runway, showing off some equally sexy designs.

Meanwhile, it's not all charity work and no play for these young models ... Bella Hadid is being linked to TWO different guys, just since she's been in Cannes. The other day she posted a pic of herself with billionaire Alshair’s Fiyaz and male model Jordan Barrett (below) and she was immediately linked to the blond hottie. But it doesn't stop there ... Bella's also been rumored to have been flirting with heavyweight world champion Anthony Joshua at the film festival -- they met at the GQ Men of the Year Awards last year.

So many men, so many see-through dresses! Life is tough for young Bella!