Nick Kyrgios packs on the PDA with girlfriend Costeen Hatzi during his training session at Wimbledon

Nick Kyrgios' girlfriend Costeen Hatzi is every inch the tennis WAG at Wimbledon

Costeen Hatzi watches Nick Kyrgios play at Wimbledon

Playing tourist! Tennis bad boy Nick Kyrgios and girlfriend Costeen Hatzi go sightseeing in London