Star Tracks
The singer stays hot in a revealing lemon gown while celebrating in D.C. Plus: Miley Cyrus, Kristen Stewart, Mariah Carey and more
More from PEOPLE
STATELY SERENADE
Mariah Carey belts out her hit "Hero" Tuesday in honor of President Barack Obama and First Lady Michelle at the Neighborhood Inaugural Ball in Washington, D.C.
For more pics and stories, don't miss PEOPLE.com's special report on the Inauguration of Barack Obama
