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The Geordie singer with former Bristol City footballer Alex Da Kid was spotted arriving at 1am.
Close pals say that she has "hit it off" with the music guru, and its real name Alexander Grant.
A friend told The Sun: "Cheryl and Alex have struck up a great relationship and have been living in each other's pockets for the past week.
"Some of the recording sessions have run into the very early hours with just the two of them and a laptop in their hotel rooms.
"Cheryl has been suffering from jet lag and couldn't sleep, so they have just worked through the night. It hasn't all been work — they've enjoyed some play too.
"If the music is going to work then they need to find their own chemistry."