For someone who's got two buns in the oven, Mariah Carey is showing her pregnant superpowers by gracing stages everywhere to plug her second Christmas album, and prove that she is the true voice of Christmas.

Carey released her second Christmas album, 'Merry Christmas II You' in early November. It debuted at No. 1 on the Hip-Hop and R&B Albums chart where it has since remained in the Top 5. The album is the followup to her highly successful 1994 Christmas album, which born the peppy holiday jingle 'All I Want for Christmas Is You.' While the original song made No. 2 on The BoomBox's Christmas Playlist, Carey rerecorded an "extra festive" version for 'Merry Christmas II You,' which also includes four brand new songs -- 'Christmas Time Is in the Air Again,' 'When Christmas Comes,' 'One Child' and 'Oh Santa!'

Last Monday (Dec. 13), a preggers Mariah Carey took to the stage and performed a collection of holiday classics during her hourlong 'Mariah Carey: Merry Christmas to You' special on ABC. The evening opened with the energetic 'Oh Santa!,' and included a guest appearance from 'American Idol' judge Randy Jackson on bass, while Carey's own opera-singing mother on a duet of 'O Come All Ye Faithful.'

Watch Mariah Carey, 'Oh Santa!'

Carey went on to spread more holiday cheer this past weekend during the 'Christmas in Washington' special on TNT, recorded the weekend prior in the D.C. Hosted by the First Family, to whom Carey first spilled the news that she was expecting twins this coming Spring, the show featured Ellen DeGeneres and performances by Andrea Bocelli, Annie Lennox, Maxwell, 'Glee''s Matthew Morrison and Miranda Cosgrove. Carey, wrapped in a red bow, sang more subdued, traditional songs and was backed by the Washington Youth Choir and American Family Choir.

Watch Mariah Carey's 'One Child'

Watch Mariah Carey's 'O Come All Ye Faithful'