Robert Pattinson Dating Dylan Penn: She’s Having Big Doubts

Sorry Rob, you're just too famous. A source tells Us Weekly that model Dylan Penn, dating Robert Pattinson since late summer, is concerned about being attached to such a big star.

"She doesn't want to be known as Rob's girlfriend," the source says of the 22-year-old daughter of Sean Penn, 53, and Robin Wright, 47. "She's afraid to get serious with him and lose her privacy."

Not that the Twilight star, 27, is putting any pressure on the 5-foot-7 stunner to settle down. After his rocky three-year relationship with Kristen Stewart, 23, imploded in May, "Rob isn't ready to be exclusive with anyone right now," an insider says. "He's just enjoying himself."

Robert Pattinson and Dylan Penn
Watch singer Jason Charles Miller chat with Us Weekly about this week's Hot Stuff scoops — including Dylan Penn having big doubts about dating Robert Pattinson. Alberto Rodriguez/NBC/Getty Images; Jeff Vespa/WireImage

For more details on Pattinson's relationship with Penn, watch this week's Hot Stuff video, as explained by Us Weekly Entertainment Director Ian Drew and special guest, "Here to Kill the Pain" singer Jason Charles Miller.

Also in the roundup: Halle Berry's daughter Nahla prayed for a baby sister; Casey Kasem's kids fight to see him; and much more!

Sign up now for the Us Weekly newsletter to get breaking celebrity news, hot pics and more delivered straight to your inbox!

Want stories like these delivered straight to your phone? Download the Us Weekly iPhone app now!