Article continues below advertisementBritney Spears seems to be kicking off the new year on a positive note.On Sunday, January 4, the "Sometimes" singer hopped on Instagram to share a candid update about her life lately. Spears posted a video of herself sailing on a boat wearing nothing but a white towel and a captain's hat.Article continues below advertisementSource: @britneyspears/InstagramBritney Spears shared a towel-clad video on Instagram.Article continues below advertisement"What if I was up there driving the boat ....