Julia Louis-Dreyfus' last day of chemo was Thursday and her 2 sons celebrated the milestone in her breast cancer battle with a video tribute ... and an assist from Michael Jackson.
Julia posted the vid of 20-year-old Charlie and 25-year-old Henry dancing and lip syncing to MJ's "Beat It" ... an homage to Mom kicking her chemo treatment's ass.
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JLD revealed she had been diagnosed with breast cancer in September and started chemo shortly after.
She captioned the video, "Pretty swell, right? Ain’t they sweet?”