PHOTOS: Kristen Stewart & Taylor Lautner Hit A Studio Together

So far, it is still all work and no play for Kristen Stewart on her second afternoon back in Los Angeles. The Twilight star spent Friday reuniting with co-star Taylor Lautner at a studio.

The casual stars looked serious as they walked around the grounds, both shielding themselves from prying eyes by hiding underneath their sunglasses. While Lautner has been in town all week (and spending lots of quality time with Taylor Swift), Stewart arrived on Thursday after leaving Vancouver with Robert Pattinson in tow. However, they quickly went their separate ways after landing with Stewart heading directly home.