Mariah Carey wowed her fans in Brazil Saturday when she put on a marathon 15-song performance at The Festa do Peão de Boiadeiro In Barretos, Sao Paulo. Check out the photos on RadarOnline.com of Mimi in a fun princess-style black gown, complete with tiara.

PHOTOS: Mariah Carey Wows Her Fans In Brazil

The princess ensemble was one of several costume changes the decidedly un-divish superstar made during the show.

Some of those outfits have led to a new round of rumors that Mrs. Nick Cannon is expecting but there has been no official word from the couple.

PHOTOS: Mariah & Nick Renew Their Vows

Mariah did send out a post-show Tweet that got our interest though. While thanking her Brazilian fans for being for loyal, she wrote, "Tonite was tuff for me 4 personal reasons, but u got me thru!"

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