Kristen Stewart's (Big) Apple Adventures

Twilight leading lady Kristen Stewart shops the glass-enclosed Fifth Avenue flagship Apple store in New York City on Thursday afternoon.

Later that night, the 18-year-old starlet joined guests Stephen Colbert and Super Diamond at the Ed Sullivan Theatre to make an appearance on the Late Show with David Letterman.

Co-stars Taylor Lautner and Robert Pattinson were also on the talk show circuit, chatting about Twilight, which opens in theatres nationwide today, with Tyra Banks earlier that day.