Article continues below advertisementBritney Spears continues to raise mental health concerns with her latest cryptic social media post.The pop star, 43, stripped nude while splaying out on her bed on Monday, October 20.Her strange Instagram share comes just days after ex Kevin Federline exposed her concerning past behavior in his memoir, You Thought You Knew.Article continues below advertisementSource: @britneyspears/InstagramBritney Spears ditched clothing altogether in bed."First time I took a picture of my face in bed !!! I look really different hmmmmmmm.