Christina Aguilera posts semi-naked photo

Christina Aguilera surprised her followers with a photo of herself wearing pink panties and a cap... only.

Judging from her post, it looks like the American singer plans to share more X-rated photos with her fans.

"Just so you know with me, it's all real, all the time. Felt like it was time to start sharing some personal stuff with you guys... And it's just the beginning. Night night. X," Aguilera wrote on Instagram.