Britney Spears has shared a health update with fans, revealing that she has lost weight this summer and that she has been using "Facetune" to "make her look bigger".MORE: Britney Spears displays her amazing figure in plunging green dressThe singer admitted that when she looked back at older pictures she could see the difference, and the mom-of-two acknowledged that although it "sounds shallow as hell" she knew fans would say "damn" if she posted the "videos of how much bigger I was in comparison