Kathie Lee Gifford, Kelly Ripa, and Ryan Seacrest shared tributes to their friend and former colleague Regis Philbin on Monday, and, as you might imagine, their heartfelt expressions were bittersweet. Philbin died Friday from natural causes at the age of 88.Gifford appeared on The Today Show to talk about her relationship with Philbin, with whom she hosted Live with Regis and Kathie Lee from 1988 to 2000.