She's one of the most recognizable faces on morning television ... but that doesn't mean it's any easier for this Mystery Taster to be identified by Rachael! She figures out that it's a female who lives on the East Coast, but is stuck until the guest reveals that her travel adventures include recent trips to Afghanistan and North Korea. "I got it from Afghanistan," Rachael says. "This is Diane Sawyer!"

Rach is happy to see her very first guest return, and starts off by asking the Good Morning America host if she's ever lost out in the battle against her alarm buzzer, which rings at 3:45 a.m. daily. "I've never slept through the show," Diane says proudly. "I have a back-up system and I have people who call at different times ... so it's very hard for me to oversleep as much as I would like to."

She has some intriguing mornings to look forward to these days as she closely watches the historic Democratic primary season. While Clinton and Obama duke it out, Diane says that keeping track of the polls and votes is the easy job. "I just think of the candidates," she says. "We're putting them through this endless marathon. I think physically it is one of the hardest things we have all watched people do." And, Good Morning America is showing its patriotism in May by repeating a popular series from the show in America. "We are doing the '7 Wonders' again and the first time we did it we went all over the globe," Diane explains. "This time we're going in the United States, we're going to do the '7 Wonders' that you have not seen in America. We had a panel and we put them to the test and they combed the country to come up with these."

In the middle of her own busy schedule, Diane is hitting a personal milestone today as she celebrates her 20th anniversary with husband Mike Nichols. "We thought we'd give you a special gift," says Rachael, who presents the typically conservatively dressed anchor with glitzy black sweats that have "Mrs. Nichols" sewn in silver across the derriere. "I just love it because they're low key," Diane jokes. She may laugh now, but the comfy clothes could be the perfect look for her cozy celebration. "Probably we'll end up doing nothing," says Diane, who adds with a smile, "Mrs. Nichols is a very happy girl."