A source close to the situation explained:
His admirer screamed from the audience:
"I love you, Neil!"
To which the actor responded, without breaking character at all:
"I’m doing something up here, motherf–ker!"
But before you go and get offended by NPH's words, he was only responding to the fan in-character since it happened right in the middle of his show!
A rep for the committed actor said:
"It was all done in good fun and fully in the context of the show. The audience went crazy, and it really was a light-hearted moment."
The show must go on!
[Image via FayesVision/WENN.]