Using Collaborative Creativity Learning (CCL) model that is integrated with PhET simulation, this study aims to improve students' scientific creativity in natural science lesson. This research is an experimental study. The sample in this study is 144 junior high school students. The practicality and effectiveness of CCL model that is integrated with PhET simulation was measured by using practical learning observation sheet, scientific creativity test sheet, and student response questionnaire. The data was analysed using t-test, descriptively and qualitatively. The CCL model that is integrated with PhET simulation to improve students' scientific creativity has been proven to be: (1) Practical (applicable in learning and practical and reliable category) and (2) Effective includes--(a) a significant increase in students' scientific creativity at a = 5%, (b) the average n-gain of students' scientific creativity was medium, and (c) the student's response to each component of learning was very positive. The implication of this research is that the CCL model that is integrated with PhET simulation can be used as a solution to improve students' creativity in a natural science lesson.