Less than 24 hours after Lizzo won three Grammy Awards and opened the 62nd annual telecast Sunday with a rousing performance, the "Truth Hurts" singer was announced as one of three headliners for Montreal's Osheaga festival at Parc Jean Drapeau, July 31 to Aug. 2. The Saturday night headliner will be joined by Dave Grohl's Foo Fighters, who will make their first appearance at