Zac Efron and Nina Dobrev were spotted looking quite friendly with each other this week, getting close as they chatted on a yacht during their sun-soaked getaway with friends in Sardinia.

Check out the pics … the actors appeared relaxed with each other — standing close together — as they shared a laugh while their vessel sailed into Porto Cervo at sunset.

It wasn’t all fun and games … earlier in the day, Nina looked serious as she was comforted by her friend Keleigh Sperry on the upper deck, with Zac nowhere in sight.

It’s unclear what may have upset her, but as you know, she and her longtime partner Shaun White just called off their engagement, surprising many fans.

As we reported, the “High School Musical” alum, Nina and Keleigh set sail together this week for Ripple Labs CEO Brad Garlinghouse‘s Italian wedding. Keleigh’s husband, actor Miles Teller, also joined, along with Chace Crawford and his model girlfriend Kelsey Merritt.

The group was spotted earlier this week, enjoying themselves as they swam, jet skied, paddle boarded and more — the men even jumped into the water from the top deck of the yacht.

Nina and Zac appear to be the single friends of the group … and fans are certainly watching to see if Cupid finds them!