BSPEARSWILDRIDE1107_01.jpgBSPEARSWILDRIDE1107_10.jpgBritney Spears BSPEARSWILDRIDE1107_05.jpgAfter purchasing her shiny new toy, Britney decided to take her pal Sam out for a spin last night! Photogs say Brit was really testing the 600 HP engine, seeing what the Mercedes was capable of as she took off down the streets.