Los Angeles: Actor Sean Penn's daughter is thrilled that her father has found love in actress Charlize Theron.

Sean Penn and Charlize Theron
Sean Penn and Charlize Theron (Pic/Santa Banta) 

The 38-year-old actress has been dating the 53-year-old actor for the past eight months, reports femalefirst.co.uk.

"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," said Dylan, Sean's daughter from his marriage to Robin Wright.

Theron sparked speculation about an engagement when she was recently spotted wearing a ring on her left hand. Dylan, 23, says she has no idea if they are planning to walk down the aisle.

She said: "I don't even know. I have no idea."

But asked if she would welcome Theron into the family, she said: "Always. Sure, why not? If it's meant to be."

And the model was equally enthusiastic about a sibling for her and brother Hopper, 20.

She said: "Always. The more the merrier."