The first lady made an unannounced stop at Mom's Apple Pie Co., a family-owned bakery in Occoquan, a small town about 23 miles southwest of the White House.
Obama perused the shop's offerings of fresh fruit pies and jams, as well as old-fashioned candies and a collection of wines and beers. "Oh there's wine!" she said walking through the store. "No one told me there was wine!"
Obama also selected two pies from the display case - one apple pie (regular crust, no crumb) and one sour cherry.
"I will be killed if I don't come out of here with pie," she said with a smile, paying cash for both. President Obama is famously a fan of pie. His favorite is reportedly sweet potato.
During the visit, the first lady was serenaded by 6-year-old Sydney Trapp of Fredericksburg, who played "Ode to Joy" on her violin.
You are on it!" Obama said, as Trapp's mother looked on. "You've earned your pie," she said.
Earlier in the day, Obama held a rally for her husband's re-election campaign at VFW Post 1503 in Dale City. She urged supporters to step up their organizing efforts to make sure every vote counts.
"I am so fired up," Obama told the crowd. "I look forward to being out there delivering this message, reminding this country what's at stake, reminding them what our president has done, what he will continue to do. And I look forward to being out there with you all every step of the way. I can't wait to keep it going."
A new Quinnipiac University poll of Virginia released Thursday shows President Obama leading rival Mitt Romney 47 to 42 percent.