Winnie, 24, seemed ecstatic to see Jonathan, 45, at the film festival.
The model looked amazing in a light pink crop top and matching shorts.
She accessorized with a thick, white headband, white sneakers and gold earrings.
Jonathan, who is best known as Kim Kardashian's best friend, opted to wear an oversized green graphic t-shirt.
He completed his look with a pair of light-washed distressed denim jeans and wore colorful slip-on sneakers.
What do you think of Winnie & Jonathan bumping into each other at the Cannes film festival? Let us know in the comments below!