Swimsuits wars! Travis Barker's ex-wife Shanna Moakler, 45, posts a bikini photo... after his new girlfriend Kourtney Kardashian, 41, poses in a one piece

Shanna Moakler posed a very alluring image to her Instagram account on Wednesday. The Playboy model was in a string bikini. She has liked a snarky comment made about Kourtney alrea…