Britney Spears is “in the process of buying a new home”. The ‘Piece of Me’ hitmaker thinks “it’s time for a change” after living in her current house for seven years and securing a $15 million book deal. In a video, the 41-year-old pop star wrote on Instagram: I’ve lived in this house for 7 years and I’m in the process of buying a new home… it’s time for change!!!! I’ve been pretty modest about the home I live in now!!!” Britney – who is shares Sean, 16, and Jayden, 15, with her ex Kevin Federline – also joked about how “I know you guys have seen me dance in my living room … but honestly I hav…