John Mayer Dresses Up as Santa for Katy Perry! (PHOTO)

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Has Katy Perry been naughty or nice?

She let beau John Mayer decide on Christmas day, tweeting a photo, where she called him her “Santa Baby.” 

The two singers have been dating on and off since August, but things seem pretty serious considering they're already spending holidays together!

EXCLUSIVE: Katy Perry and John Mayer Are Definitely Dating

The 28-year-old has been spending lots of time with the bad boy, going on concerts and dinner dates, since divorcing Russell Brand in Dec. 2011 after one year of marriage.

PHOTO: John Mayer Feeds Katy Perry During Dinner Date

Do you think Katy and John are good together? Let us know in the comments!