Mimi’s back. On Wednesday, the 48-year-old songstress posted about the new single, "GTFO," on Instagram, with the caption “8 am ET tomorrow.” Mimi’s last single, “I Don’t” featuring YG, was released in February 2017. Before that, her only new recording was the track "Infinity," featured on her third greatest hits album, 2015's '#1 to Infinity.' Carey's ongoing Vegas residency, 'The Butterfly Returns,'