Not All Work for the 'Twilight' Cast

The "New Moon" cast is in Vancouver to film the third installment in the "Twilight" series, "Eclipse."

Robert Pattinson, 23, and Kristen Stewart, 19, have been battling constant rumors of a relationship since "Twilight" first came out. This time it might prove to be true. The L.A. Times reported that the costars were drinking, smoking and canoodling throughout the Kings of Leon concert on Saturday night in Vancouver, Canada.

MTV.com has another theory: Stewart is dating co-star Taylor Lautner. They reported that Stewart and Lautner have been pictured together many times in the recent past, including at Comic-Con and the Teen Choice Awards.

Another theory MTV.com has posted is that the two are just hyping up the love triangle between Bella, Jacob and Edward in "New Moon," which is coming out Nov. 20.

The whole cast has also been seen enjoying themselves at Miko Sushi in Vancouver, according to the Vancouver Sun.