Khloé went all out for her daughter True's 5th birthday, throwing her a "pastel/octonaut extravaganza ... Octonauts-themed party complete with balloon arches, a dessert wall and real undersea ...

Khloé Kardashian and Tristan Thompson reunited to celebrate their daughter's big day True Thompson first birthday balloon ... shaped displays of pastel balloons in a rainbow of hues flowed ...