The singer, who is expecting his first child with stylist Briana Jungwirth in March, is thought to have started dating Campbell, reports mirror.co.uk.
First the pair were spotted getting close at an ice cream parlour, and now the American actress has flown all the way to the singer's home turf.
A source told The Sun newspaper: "Danielle and Louis are really into one another.
"She's flown out here (the UK) just a week after he was with her in her home town. She's been enjoying herself, sightseeing with pals in the day, but it's clear they'll see each other away from prying eyes," the source added.
"Louis normally has a big New Year bash at his, so the chances are she'll meet some of his friends and family there for the first time."
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