The smitten 20-year-old singer brought the lingerie model along to the 'Class of '92' premiere in London on Sunday (01.12.13) to meet his fellow 'Story of my Life' hitmakers, just one day after the pair enjoyed a romantic cinema date.
A source told the Daily Mirror newspaper: ''The rest of the band were properly introduced to Barbara, though most of them met her briefly before. This time, though, it was as Niall's date.''
It appears things are moving quickly between the lovebirds, who were spotted cosying up at the Everyman cinema in Belsize Park, north London, this weekend as they watched the new instalment of blockbuster franchise, 'The Hunger Games: Catching Fire'.
An eye-witness said: ''They were laughing and joking together throughout the film, and both were dressed casually. You could tell they were comfortable in each other's company.''
Niall has also recently been linked to 'X Factor' UK contestant Tamera Foster and British reality TV star Louise Thompson.
This could be the pair's biggest failing yet.
The band have decided to reform in the wake of Prince’s sudden death last week.
Harrington is currently on London’s West End, in a modern-retting of Christopher Marlowe’s classic tale.
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