She told the gathering of elementary school kids at the White House last week that "every now and then," she will "sneak out, without telling anybody" to check out restaurants around town.
"We go and test out all the fun places to eat in D.C., like I went to Five Guys and nobody knew it. It was good," she said to knowing laughter. "So we sometimes sneak out and do little things like that."
As for her free time, the first lady admitted she doesn't have much of it these days, especially since the family's new puppy moved into the White House.
She said she does what most moms do every day, spend their free time with their children.
"I like to go to my kids' games. They've got soccer now, so I spend a lot of time doing their things and watching their movies and, you know, making sure that their friends have a good time," she said.
She may be mom at home. but she's "Mighty Michelle" in the U.K. The British media gave the first lady the nickname after she and her husband traveled to Europe in April. While the president focused on the global economic crisis, the first lady spent much of her time with the wives of other world leaders, and the international media spent much of its time chronicling her every move and every wardrobe change.
She held her own in the widely anticipated fashion face off with model-turned-singer-turned-first lady of France, Carla Bruni Sarkozy. Obama's aides say she and Sarkozy enjoyed each other's company. They shared lunch, had a lively conversation and seemed to genuinely like each other.
And in a country that prides itself on keeping a stiff upper lip, Michelle Obama dared to show a little emotion. The first lady teared up when speaking to teenagers at a London girl's school.
"All of you are jewels," she said. "You are precious, and you touch my heart. And it is important for the world to know that there are wonderful girls like you all over the world."
The first lady shared her own story of growing up on the South side of Chicago, and eventually making it to the White House.
"I want you to know that we have very much in common, for nothing in my life's path would have predicted that I'd be standing here as the first African-American first lady of the United States of America," she told them.
She encouraged them to study hard and believe in themselves. Her words seemed well received, but it was her personal touch that may have made the biggest impact. After her speech, Obama hugged many of the students, prompting them to rush the stage and bringing some to tears.
Blogger Belton said if there's anything Michelle Obama has displayed in these 100 days, it's versatility.
"She 'metamorphed' into this cross between Susie Q. homemaker meets I'm every woman executive meets classic diplomatic. I can be in a ball gown first lady, I can be at a business meeting, I can go visit every department here in our government and speak to anyone, and go meet the queen of England in my perfect little cardigan sweater, and I'm ready to go," Belton said, laughing. "I think she really studied and got into the role and just like everything else in her life, she's prepared herself. She's adaptable."