The Hollywood star was seen with sister DeOndra Dixon at the recent Be Beautiful, Be Yourself Jet Set Fashion Show, which benefits the Global Down Syndrome Foundation.
Speaking about the evening, he said to ET: 'This is just so amazing that she gets to do her thing where the spotlight is on her. The focus is on her. It means a lot.'
He added: 'I don't call it a condition. I just call it living... When she loves, she loves. When she's mad, she's mad. When she cries, she cries. When she's happy, she's happy, but she always tells the truth.'