She plays the Queen of England on stage and is nearly 70 years old but that didn't stop Helen Mirren gladly acting like a kid again when she appeared as a guest on The Tonight Show Starring Jimmy Fallon on Monday, March 30.

The British Dame was being quizzed by show host Fallon about the poshness of her accent when he brought up the subject of sucking in helium from a balloon.

Bursting into laughter, Mirren told Fallon she hadn't tried the helium trick since she was 11 years old. But far from wanting to act her age, the almost septuagenarian was thrilled to have the chance to act like a kid.

Looking amazing in a tight blue dress, Mirren, who recently revealed her new L'Oreal campaign, went on to reduce Fallon to hysterics by dishing out a string of double entendres around the subject of sucking the air out of a balloon.

And when the balloon squeaked, she even took responsibility for it, apologizing and pretending she was the one who had gas!

Watch the whole unexpected and wonderfully cheeky sketch in the video above.