'Firefly Lane': Katherine Heigl and Sarah Chalke on Saying Goodbye to Tully and Kate (Exclusive)

Katherine Heigl and Sarah Chalke chat with ET's Denny Directo about season 2 of 'Firefly Lane.' The actors open up about saying goodbye to Tully Hart and Kate Mularkey in the show's final season, which picks up following season one's cliffhanger. Katherine and Sarah explain how their real-life friendship made filming Tully and Kate's estrangement that much harder. Plus, Katherine reflects on '27 Dresses' as the rom-com nears its 15th anniversary, admitting she and husband Josh Kelley recently watched the 2008 classic! 'Firefly Lane' drops Part 1 of its final season Dec. 2 on Netflix.