Annie, 40, Lily, 37, Cayden, 17, Hayes, 15, and Grace, 13, joined their 69-year-old father for photocalls at the event.

Here’s what we know about the Yellowstone star’s children, who he shares with three different partners:

1. Annie Costner

Costner welcomed his first child Annie with ex-wife Cindy Silva on April 15, 1984. She dabbled in acting as a child, starring in Dances with Wolves, Waterworld and The Postman with her dad in the 1990s, per IMDB, as well as The Baby-Sitters Club.

2. Lily Costner

The Bodyguard actor and Silva had their second daughter Lily together on August 4, 1986, notes People. She has made a few appearances in films, but seems to be more focused on her music career these days.

In 2014, Costner told HuffPost about his daughter’s talents. “Lily is an amazing singer and songwriter. She can be a really huge star if that’s what she wanted. I’m not sure she wants that. She’s really gifted. Lily’s way is not to knock doors down. I think she wants a quality of life … She’s seen the quality of life that we’ve had and sometimes the idea of stardom, I think, is a mystery to her.”

3. Joe Costner

Silva and Kevin’s third child together, their son Joe, was born on January 31, 1988. He was also in The Postman with his sisters, but grew up to work as an audio engineer and production sound mixer in the industry, according to People magazine.

Costner told HuffPost that his son had always been “a solid person” with good friends, adding: “You really can judge how well he has done in life by the quality of his friends and how he has kept them. I’ve tried to encourage him, it’s good to be your own person.”

4. Liam Costner

Eight years later, in November 1996, Liam Costner came along after Kevin Costner split with Silva and had a brief relationship with Bridget Rooney, the niece of the Pittsburgh Steelers’ then-owner Dan Rooney. Business Insider reports that Bridget ended up marrying billionaire William Koch, and both mother and son tend to stay out of the spotlight. Unsurprising then, that he was absent from the Cannes red carpet.

5. Cayden Costner

In addition to acting, the Westworld star is lead singer in his rock band, Kevin Costner & Modern West, and in an interview with People after Cayden turned one, proudly told the magazine that his son was already expressing an interest in music.

“He has a couple of little guitars, and he listens to the band and sits on my knee sometimes when I do rough tracks,” he said.

6. Hayes Costner

Kevin and Baumgartner had their second child together, Hayes, on February 12, 2009, according to Business Insider. His name was reportedly inspired by a character in a Western film he was working on at the time.

7. Grace Costner

Costner’s youngest child was born on June 2, 2010 to him and Baumgartner. In an interview with the Today show in 2016, he said: “She’s sewing and dancing, but when she sees the ball bouncing out in the backyard, I can feel her gravitate out with the boys.”