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Published 10:49 9 Apr 2015 BST
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She is well known for her role in 'Glee'.
“No one thought much about it but recently they’ve become very close and are behaving quite couply.
“Dianna… she’s really down to earth and loves how Nicholas lives a normal life,” the insider continued.
“They’ve been friends for a long time. It’s early days but things between them are ticking along nicely.”
Nicholas shot to fame for 'About A Boy'.Celebrity