Sticker Star

The Sticker Star is Kersti's home. When the Sticker Comet arrives at the town of Decalburg for the Sticker Fest, Kersti arrives and helps grant people's wishes. During the Sticker Fest however, Bowser interupted the party and touched the Sticker Star, which caused him to aquire great dark power and scatter the Royal Stickers. This nearly destroys the town of Decalburg. When Mario wakes up the next morning, he finds Kersti and they fix up the town of Decalburg and start their adventure from there.<br<

Trivia
Kersti says that she has been sent from the faraway Sticker Star, and she won't get back until she finds the Royal Stickers. This proves that Kersti is going to be Mario's partner.