Machine Gun Kelly and Megan Fox are taking their co-parenting venture international ... because they're down in Costa Rica together with their baby girl.

After bravely beating leukemia, local teen Sulli Hajek is heading off on the adventure of a lifetime — a trip to Costa Rica, made possible by Make-A-Wish Georgia.

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The Shakespeare in Love actor, 55, described holding her as she 'slipped away' in what he described as the 'unexpected horrific accident'.