Christina Applegate must be a fan of  'Jersey Shore.' How else to explain her frequent interruptions during Pauly D's appearance on 'The Tonight Show' last night?

Pauly told Jay Leno that he once DJed an event for Kim Kardashian and that his relationship with the socialite was purely professional. Applegate, however, wasn't buying it. "Yeah, right," she scoffed. "I said that out loud? I'm so sorry."

Later, she interrupted Pauly as he described a photo taken with Britney Spears, and she even touched his famous 'do on the sly. "I'm sorry, I had to," Applegate apologized. "It's stiff."

[via AOL TV]