Dog-Walking Styles of the StarsBlake Lively and Penny are on set, Carrie Underwood keeps it casual in sweats, and Jerry O'Connell jogs

Credit: Bauer Griffin, National Photo Group, Bauer Griffin

Updated: Wednesday Jan 12, 2011 | 06:00 AM EST

CARRIE UNDERWOOD

Air travel presents more than its share of challenges, so Underwood maximizes her comfort with cozy clothes and her best pal Ace in her arms.