Good Morning Britain viewers have been left baffled by pop diva Mariah Carey s appearance on Monday s installment following the breaking news of a shooting in Las Vegas.The 47-year-old hitmaker was due to chat to host Piers Morgan and Susanna Reid about her upcoming Christmas shows in London and Paris before news broke about the shocking incident at the Route 91 Harvest Music Festival   which so far has claimed the lives of 50 people and left more than 400 injured.Appearing in a live feed from her Beverly Hills home, Mariah was seen stretched out across a chaise longue in a red gown as the British TV presenters asked her about the attack near the Mandalay Bay Resort and Hotel.The Grammy award-winning singer is no stranger to the world-renowned Vegas strip, having held residency at Caesars Palace s the Colosseum in recent years.Despite admitting she didn t know enough about the attack, Mariah shared her condolences to all who were affected.Following the interview, GMB s Piers took to social media to explain that Mariah s reps knew that they would ask her about the horrific attack.Writing to his 6.12million followers, he retweeted a comment that criticized the interview and added:  We told Mariah s people before the interview. Her reaction seemed very relevant given she s a performer who often resides in Vegas.  Daily MailAlthough fans have come to expect that whenever Mariah is being interviewed, that she will make her viewers uncomfortable, this latest interview with Piers Morgan has created a bit of a social media meltdown. Social media users couldn t get over how Mariah was draped across the sofa like she was posing for a glamorous magazine shoot during the morning talk show.  It was the CHRISTMAS tree in the background, however, that had everyone really questioning her sanity.   Piers Morgan cleared up the confusion about the Christmas tree when he told viewers that,  Mariah was booked to do an interview about her UK Christmas tour.  So without addressing the elephant or Christmas tree if you will, in the room, Morgan was able to explain (kind of) why Mariah Carey was propped up on her couch with a lighted Christmas tree behind her during the first official week of fall 