User blog comment:Misho64/OMG!/@comment-25181180-20150727153349/@comment-20028295-20150728191926

Wrong! That's Rosalina. She made her first appearance in the game Super Mario Galaxy and has since been an increasingly prominant character in the Super Mario series. She was in Mario Kart Wii and Mario Kart 7 (I think), and she even appeared as a playable character in Super Smash Bros. 4!  So it's not a big surprise that she's going to return in Mario Kart 8 as well.