Charlize Theron has gotten the seal of approval from Sean Penn's daughter.

The 38-year-old actress has been dating Sean, 53, for the past eight months and his daughter Dylan, 23, from his marriage to Robin Wright, is thrilled that her dad has found love with the blonde beauty.

Dylan 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.''

While Charlize sparked speculation about an engagement when she was spotted wearing a ring on her left hand earlier this week, Dylan insisted she has no idea if they are planning to tie the knot.

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

But asked if she would welcome Charlize into the family, an enthusiastic Dylan replied: ''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 enthused: ''Always. The more the merrier.''

It was previously claimed Charlize - who has two-year-old adopted son Jackson - is keen to adopt a child with Sean shortly after they've exchanged vows.

An insider said: ''Charlize always intended to have another child.''

Sean has also been bonding with Charlize's young son.

The insider added: ''He is a father figure to him.''