Article continues below advertisementNina Dobrev is showing ex-fiancé Shaun White what he's missing with her newest racy snap.The Vampire Diaries alum, 36, took to Instagram on December 27 to show off her physique in a teeny black string bikini while on a holiday vacation.Article continues below advertisementSource: @Nina/InstagramThe 'Vampire Diaries' alum showed off her body in a skimpy bikini."Mentally on airplane mode," Dobrev captioned the hot snap. She rocked dark two-piece as she arched her back in the photo while posing in what looked like an open-air sauna.