Is Mariah Carey a world-class singer? Yes. Is that why we love her? Er, not really.

The preggo-with-twins melisma factory turned up last night on TNT's Christmas in Washington, where she performed for President Obama and the First Lady alongside Annie Lennox and Maxwell. And though her vocals sounded typically great in a choir-backed rendition of "O Come All Ye Faithful," we're bummed that Carey skipped the opportunity to do any of the zanier material from her recent Merry Christmas II You.

Washington, D.C., folks—where even pop stars are forced to compromise.