Céline Dion's fans voiced their concerns about the star's health, but on Friday the singing sensation took to her Instagram with an important update, filmed from inside her family home.DONATE NOW: What can you do to help Ukraine?With a message directed to the World Leaders, who are discussing the ongoing crisis in Ukraine on Saturday, Céline posted an appeal video to her Instagram feed.WATCH: Céline Dion health battle explainedCaptioning the post both in French and English, the star wrote: "I #StandUpForUkraine and for refugees around the world. I’m calling on world leaders to help all those who are forced to leave their homes.