Article continues below advertisementJayden James Federline, the youngest son of Britney Spears, made his first public appearance since his mother entered a treatment facility. In photos obtained by an outlet, the 19-year-old was seen at Erewhon in Los Angeles on Monday, April 3, casually dressed in a white tank top and Nike shorts while he grabbed a smoothie.Tap Here To Add Ok Magazine as A Trusted SourceArticle continues below advertisementSource: @britneyspears/InstagramJayden James Federline was spotted in Los Angeles shortly after his mother entered rehab.