Sean Penn's daughter Dylan has said she loves how happy her dad and Charlize Theron are together saying "they're a great couple."

Penn and Theron have been dating for almost a year and 23-year-old Dylan, whose mother is House of Cards star Robin Wright, told Us Weekly, "They're a great couple.

"They're both very happy and yeah, I love it. They're both extremely strong personalities and they're very intelligent so conversation lasts between them."

With rumours flying that the couple were engaged, Dylan insisted that she had not heard, "I don't even know. I have no idea."