"They've been dating a month or two," a Pattinson source tells People. "He's crazy about her."
And it looks like Pattinson isn't camera-shy when it comes to being spotted with Penn, a model.
The new couple was reportedly seen out together taking in a Mickey Avalon show at the Viper Room in Los Angeles on September 7, before going to the Chateau Marmont for drinks.
Pattinson and Stewart broke up in May, after more than three years together.
Star Sightings: Celebrity Candids
Are These Celebs Too Tan?! Cast Your Vote!
- Arts & Entertainment
- Robert Pattinson
- Sean Penn
- Kristen Stewart