R-Patz's new girlfriend 'afraid to get serious'

Robert Pattinson's new girlfriend, Dylan Penn has confessed that she is concerned about being attached to such a big star.

A source revealed that the 22-year-old model doesn't want to be known as Rob's girlfriend.

She is infact afraid to get serious with him and lose her privacy, Us magazine reported.

However, the source also revealed that the 'Twilight' star wasn't ready to be exclusive with anyone right now and was just enjoying himself.