B ritney Spears has asked fans not to call the police after sharing another video showing her dancing while twirling knives, which she insists are fake. Local authorities were reportedly asked to do a welfare check on the pop star, 41, after she sparked concern earlier this week following the first clip Spears shared with the sharp-looking props in both hands. A source told US news outlet TMZ that law enforcement attended the Los Angeles property that she previously shared with estranged husband Sam Asghari on Thursday “out of an abundance of caution”. The insider added that the mother-of-two spoke…