Robert Pattinson's New Galpal: Sean Penn's Kid?

Sorry, Kristen Stewart: Robert Pattinson is reportedly dating Sean Penn and Robin Wright's daughter, Dylan. "They've been dating a month or two," a source tells People. "He's crazy about her." Pattinson and Stewart were on-and-off for quite a while after she cheated with Rupert Sanders, but they officially broke up in May, People notes. Pattinson and Penn, 22, were first spotted together earlier this month. In other "new celebrity couple" news:

• Supermodel Kate Upton is dating Dancing With the Stars' Maksim Chmerkovskiy, PopSugar reports. They've been a rumored couple since June, but made their public debut walking hand-in-hand in New York yesterday (click to see the picture).
• Earlier this week, Joseph Gordon-Levitt revealed to Howard Stern that he has a girlfriend, Us reports. "I tend not to really like to talk about it in public," JGL said. "She is not in show business" and "really doesn't want to be a part of [the spotlight]," he added. They met through "mutual friends."

(More Joseph Gordon-Levitt stories.)