See the week's five best-dressed stars, including Katie!

Plus: T.R. Knight has a theory about his short stature and more from Wednesday's shows

PEOPLE.com's intern Aaron visits the Art Institute of Chicago to see if the single singer should log on and mingle

Plus: Jane Krakowski and Kelly snub Reege and more from Tuesday's shows

The Hills star invites us on a shopping date in Atlantic City

Mike Rowe has a stinky encounter – and lives to talk about it!

Zac and Issac Hanson name the cleanest (and dirtiest) streets they've ever walked – barefoot – for charity!

Plus: Gerard Butler flirts with a Brit and more from Monday's shows

Plus: Penn Badgley gets into shape and more from Friday's shows

The Jenny Craig spokeswoman shares her get-fit regimen in a new exercise DVD – and talks about her fab new body part