Celebrity Sighting?

In Malibu yesterday I got a glimpse of two people who I am almost certain were 1) Billy Zane (Titanic) and either 2) Kate Winslet (Titanic) or Gillian Anderson (X-Files). I'm not going to add them to my celebrity sightings section since I am not 100% certain. I'm guessing it was the Titanic Team but don't know for sure. I love living in California!