Haylie Duff: Hello, Doggy!The starlet shares a smile with her fluffy pup. Plus: T.R. Knight's special guests, Naomi Watts's furriest family member and more!

Credit: Splash News Online

Updated: Monday Apr 20, 2009 | 03:29 PM EDT By: Kate Hogan

SET VISITORS

Grey's Anatomy stars T.R. Knight and Katherine Heigl welcome some special friends – Knight's pups! – to the Los Angeles set of their hit TV show Thursday.