Rachel Bilson and actor Hayden Christensen were reportedly "kissing" in the oceans of the Caribbean this week.

The 30-year-old actress and her on-and-off boyfriend of five years Hayden visited Barbados together this week.

The pair looked extraordinarily happy to be spending time with one another as they frolicked around the beach together.

"Rachel and Hayden went into the water and were kissing," an eyewitness told Us Weekly magazine. "They were really sweet together."

Rachel also spent time on her tropical holiday relaxing with family members.

"At one point, Rachel was playing with her half-sister, Rosemary, and helping her build sand castles," the onlooker detailed.

Rachel has spoken previously about the nature of her and Hayden's romance.

"If you're in a relationship for a long time and you grow together, I think that's the goal," Rachel told USA Today. "So it's definitely at a different level, and I think that's how love should be, and it should always grow."

The Hart of Dixie actress has been dating boyfriend Hayden Christensen since 2007. The pair called off their engagement in the summer of 2010, but reignited their relationship in December of the same year.