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Celine Dion and Alanis Morissette join Stand Up For Ukraine. European Commission President Ursula von der Leyen and Canadian Prime Minister Justin Trudeau announced the event on Saturday and are hoping to use the platform to mobilise support and funding for humanitarian efforts in the nation following the invasion of Russian forces last month. A host of celebrities are joining a social media rally for the summit on 8 and 9 April. In addition to Dion, Morisette, and The Weeknd, other stars set to participate include Billie Eilish, Billy Joel, Chris Rock.