"Project Runway" hostess Heidi Klum is talking to "Extra" about being pregnant with baby number four! How many more little ones does Heidi want -- and how does she get back into shape in a snap?

Then, it's Christie Brinkley's adventures in dating! Does she have a secret boyfriend?

Plus, the "Extra" Lifechangers introduce the 21-Day Detox diet. Find out the toxic foods that can cause cancer! All this and more on the next "Extra"!