Dick Van Dyke may be turning 100 on Dec. 13, but his “Mary Poppins” co-star says the legendary actor has always been a mischievous kid at heart.

“It was so much fun. Especially because of Dick,” Karen Dotrice, 70, told The Post of working with Van Dyke on the 1964 Disney classic.

“The minute the camera wasn’t on him, he was just a badly behaved little boy.”

Dotrice, who played young Jane Banks alongside Van Dyke’s joyful chimney sweep Bert and Julie Andrews’ magical no-nonsense nanny Mary Poppins , still vividly remembers her wild first-ever encounter with the Hollywood icon.

“The first time I met Dick, I was having a costume fitting at Burbank Studios and arrived there, and he was bent over double, having a plaster cast made of his bottom,” she laughed. “You can only imagine him s

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