David Letterman may interview celebrities on a daily basis, but that doesn’t mean he’s keeping up with the Hollywood gossip. During an interview last night with Jessica Biel, the late night host finally realized that Justin Timberlake and Cameron Diaz were so 2006. The singer is Biel’s boyfriend now, and has been for some time.

After checking out pictures from their “Kiss Me” cam spectacle, Letterman asked the Easy Virtue star about the relationship. “And you’re dating the guy? We know this, we don’t know this? We can talk about it, we can’t talk about it?” When Jessica revealed that they’ve been an item for “a few years,” David replied:  “A few years! Really? Am I the only one who doesn’t know this?”

Uh - yes, Dave. You are.