Caitlyn - who was known as Bruce Jenner before her transition - attended the awards ceremony on Wednesday (15.07.15) to accept the Arthur Ashe Courage Award and her 59-year-old ex-wife has admitted how proud she felt of her.
Kris said: ''I think it was amazing and very brave. I think she looked beautiful.''
Caitlyn - who was an Olympic champion in her younger years as Bruce - urged athletes to be more accepting of transgender people during her moving speech.
She said: ''This transition has been harder on me than anything I could have imagined.
''And that's the case for so many others besides me. For that reason alone, trans people deserve something vital. They deserve your respect.
''And from that respect comes a more compassionate community, a more empathetic society, and a better world for all of us.''
Meanwhile, 'Keeping Up With the Kardashians' star Kris - who has daughters Kendall, 19, and Kylie, 17, with Caitlyn as well as children Kourtney, 36, Kim, 34, Khloe, 31, and Rob, 28, with the late Robert Kardashian - also spoke about how much she loves spending time with her family.
Speaking at Amazon's Summer Soiree at Los Angeles' Sunset Tower, she told Us Weekly: ''I love being with my kids. I was on my way here to support the girls, the Foster girls, and I called Kendall and said, 'Get over here, let's go there for a minute and I'll take you to dinner.' That's the way it goes in my family, it's always spontaneous.''