Bieber, 21, kept fans guessing when he kissed longtime friend Hailey Baldwin on Instagram Sunday night following their very cozy tropical vacation together.
The "Where Are U Now" singer shared the snap after performing at Leonard DiCaprio's St. Barts New Years Eve party on Thursday night. The Canadian musician was joined at the star-studded party by Robin Thicke and DiCaprio's pals Kevin Connolly and Lukas Haas.
Bieber and Baldwin, 19, are no stranger to romance rumors. Earlier this year, the model daughter of Stephen Baldwin insisted that the often-cozy pair were not an item.
"We're just friends. I've known him for a long time, since I was about 13," Baldwin told E! in February. "He's just going through a time in his life where he's transitioning in a really positive way and he needs good people around him. And I'm trying to be a good friend and be there for him and support him."