Christina Aguilera Shares X-Rated Bathtub Selfie for Halloween

• Christina Aguilera shared a highly NSFW selfie from her bathtub.
• The photo was posted ahead of Halloween.
• Aguilera is known for her racy social media posts.
• The post is part of her 'Xtinaween' Halloween celebration.
• The photo was shared on multiple outlets including Billboard and New York Post.