Zac Efron and Nina Dobrev appear to be enjoying a flirty exchange while holidaying with friends in Italy. Deux Moi has shared photos of the two single actors laughing together and looking cosy on board a yacht with a group that included Chase Crawford, Miles Teller and Kaleigh Teller. The pair had been previously spotted on board the yacht last week, when Teller shared more photos of the group off the coast of Italy. Neither Efron nor Debrov have publicly shared the nature of their relationship. Efron's romantic history includes a high-profile relationship with High School Musical co-star Vanessa Hudgens from 2005 to 2010.