Actor Sean Penn has reportedly warned Rob Pattinson not to mess his daughter Dylan Penn around.

The Twilight star has reportedly been romancing model Dylan Penn and her father Sean Penn is said to have had a chat about their potential relationship.

A source told The Sun newspaper: ''Rob and Dylan get on well and really fancy one another. It's obvious Dylan is smitten.

''But Sean had a chat with Rob recently. Sean knows what it's like to be a young, successful actor and the beautiful women that come with it.''

The insider added: ''He gave his piece about not getting too heavy with his daughter if he's playing the field, as he doesn't want to see her hurt.

''But it's backfired. Rob backed off but Dylan found out and has gone tonto at her dad.''