Ariana Grande is “open” to having a face-lift. The singer, 31, made the admission when she sat down to reveal her beauty tactics while sitting for a lie detector test with Vanity Fair – during which she also shared all the cosmetic procedures she has had to stay looking young. When her ‘Wicked’ co-star Cynthia Erivo, 37, aske Ariana during the video chat: “Did you ever get any work done to feel more popular?”, the singer denied having any procedures. She also rejected rumours she had got a nose and boob job – with the polygraph examiner deployed by Vanity Fair confirming she was telling the tr…