Michelle Obama has quite the packed London weekend ahead as leader of the US Olympic delegation. First, she's breakfasting with US athletes. Afterward, she'll be joined by more than 1,000 kids for a healthy-living event. Then it's a Buckingham Palace reception with the queen, and finally tonight's opening ceremony. The rest of the weekend will be similarly filled with Olympic events, plus a meeting with her British counterpart, Samantha Cameron. In leading Team USA, she's following in the footsteps of both Laura Bush in 2006 and Hillary Clinton in 1994, the AP notes.