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'Not Feeling So Great': Ariana Grande Complains Of Sickness After Being Spotted At Vegan Restaurant

Ariana Grande has been jetting around the world on a whirlwind promotional tour in recent weeks so it's hardly surprising that the poor starlet has fallen ill this week, admitting that she's “not feeling so great,” just hours after she was spotted visiting a vegan restaurant.“Not feeling so great... can't stop coughing... going to bundle up and drink tea all night. hope everyone's having a good day. sending u love,” Ariana tweeted yesterday. “Feel like everyone's under the weather right now. may just be the time of year... hope everyone's getting rest & taking care! stay warm,” she added.

Earlier in the day, Ariana was spotted visiting the Cafe Gratitude in Los Angeles where other celeb diners included Beyonce and Jay Z, who were celebrating the rapper's 44th birthday, and 'Les Miserables' actress Anne Hathaway.

Last night, Ariana's performance at the Rockefeller Center in New York for the Christmas Tree Lighting was aired in the US last night and saw Mariah Carey, Leona Lewis and Mary J. Blige among the artists to grace the stage.

Meanwhile, the 20-year-old has one more festive track lined up - her cover of 1953's ultra-feminine Christmas classic 'Santa Baby,' which has been recorded by everyone from Eartha Kitt to Taylor Swift to the Pussycat Dolls to even Michael Bublé. There is one track that Grande has declared too sacred to cover though - Mariah Carey's ‘All I Want For Christmas, which she recently admitted is "untouchable.”

But, she hasn't been shy about penning lyrics for her own original Christmas tunes. Ariana told MTV News: "You just write about your feelings and throw in a fireplace here and there, a sensible mistletoe lyric, and you got it."