Alicia Keys knows how to rise to an occasion. Performing last night at the Commander in Chief's Ball as part of President Obama's inauguration festivities, the singer modified the lyrics to her song "Girl on Fire" in tribute to the president and Michelle Obama. 

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"He's living in a world and it's on fire," Keys sang on a medley that started with "New Day." "Filled with catastrophe / But he knows he can find a way." Later, the singer ad libbed, "Everybody knows Michelle is his girl / Together they run the world."

Keys was part of an inaugural bill that also included fun., Soundgarden, Brad Paisley and, for the Obamas' first dance, Jennifer Hudson serenading the first couple with Al Green's "Let's Stay Together."