Rachel Bilson, Hayden Christensen reunite in Barbados months after calling off engagement

Rachel BilsonandHayden Christensen's on-off romance took an upswing over this past weekend.

The couple, who reportedly threw in the towel on their over three-year relationship in March, were spotted soaking up the sun during an island getaway toBarbadosto celebrate Christensen's 30th birthday.

Bilson, 29,was photographedshowcasing her fit physique in several tiny string bikinis while spending the day swimming in theCaribbeanocean with Christensen, whom she met on the set of"Jumper"in 2007. The low-key couple later got engaged in December of the following year.

But last summer, the actress was spotted sans engagement ring as reports surfaced that she and her"Star Wars"beau were"taking a break"to reevaluate their relationship. One of the main reasons for the split was reportedly due to the distance between Bilson inLos Angelesand Christensen inCanada.

Bilson's rep confirmed in August that the couple's engagement was off, but the two appeared to be giving their relationship another shot when they were spotted hanging out again in L.A. three months later.

Despite breaking up and making up yet again, the couple may have to face another geographical obstacle if Bilson continues working on her new pilot,"Hart of Dixie,"inWilmington,N.C.

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