Amber started the shade-slinging by going on a radio show and ripping Tyga for dating 17-year-old Kylie Jenner. The back story, of course, is Tyga's ex Blac Chyna is Amber's BFF. Then Khloe Kardashian stood up for her kid sis with a tweet reminding everyone Amber's admitted she was a "stripper since I was 15 years old.”