It's a toss-up of who's been busier lately: Michelle or Barack Obama. While the president travels the country, the first lady's been making moves of her own, including on the "Late Show With David Letterman" Monday night.

Following her success on the "Tonight Show" last month, Mrs. O bravely took a seat with Letterman and let him pry away. Looking sleek and fashionable in a white, green and blue colorblock dress by Preen (and her Alexis Bittar brooch, last seen at the State of the Union address), Michelle answered all sort of questions for the late night host.

Our favorite topics, of course, were shopping and that adorable First Pup. Letterman asked the first lady about her freedom of movement -- "If you said, 'I'm going to the 7-11 to get a slurpee,'" asked Letterman, "could you do that?"

"I technically could. It would drive a lot of people crazy," answered Michelle gamely. "I've threatened to do it, I do it all the time. I've said 'I'm walking out that door. I'm leaving.' And you see people talking in their wrist -- 'She's kidding!'" she added, mimicking the Secret Service. "I'm gonna do it one day!"

Of course she has made at least one sneaky trip out -- to Target. She recalled to Dave:

I went to Target. I thought I was undercover. I have to tell you something about this trip though. No one knew that was me, because a woman actually walked up to me, I was in the detergent aisle, and she said -- I kid you not -- she said, 'Excuse me, I just have to ask you something."

And I thought, 'Oh, cover's blown.'

She said, 'Can you reach on that shelf and grab me the detergent?' I kid you not. And the only thing she said -- I reached up, because she was short -- and I reached up, pulled it down, and she said, 'Well, you didn't have to make it look so easy.'"

She is tall, that Michelle. She also is a proud pet owner. When Letterman asked about Bo, Michelle beamed, "He is the smartest dog on the planet. He is my son. I have two girls and a boy. [...] He's very well-mannered, he's very even-tempered. He has a busy schedule, I mean appearances... we're thinking about getting him an agent."

See the whole episode here and a clip (about Bo! So cute!) below.

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