According to http://www.kheigl.com/, this is a line up of her T'V appearances:
"Upcoming Interviews & PromotionLove KH's interviews!! Will definitely be tuning in.
To promote the release of her new romantic dramedy "Life As We Know It" which hits theaters on October 8th, Katherine will be a guest on a number of TV chat shows towards the end of September.
She will be visiting New York to hit the chat show circuit and fans can look forward to seeing her on the Monday, September 27th edition of Live! With Regis & Kelly. Later the same day, Katherine will also be chatting to The Late Show's David Letterman, and on Thursday, September 30th, she will be a guest on The Martha Stewart Show.
Please check your local listings for broadcast times."