The actress, who plays Tina McIntyre in the ITV1 soap, was apparently seen waiting for a taxi with the singer following a night out in the city, before returning to the Radisson hotel where the band were staying.
They allegedly talked at the lift for around 15 minutes. An onlooker told the News of the World: "They were giggling and she touched his coat a lot and gently pushed him across the floor with her hands on his back.
"It was like they were trying to make up their minds up over something. I kept expecting her to give him a kiss and go home but all of a sudden they had a quick look at who was about, hit the call button and jumped in the lift."
A friend insisted that they didn't spend the night together, saying: "They are very good friends and very comfortable in each other's company."