By Megan Daley
Updated March 31, 2015 at 02:34 PM EDT
Douglas Gorenstein/NBC

The Queen, a.k.a. Helen Mirren, showed up on Monday’s Tonight Show, where host Jimmy Fallon recognized her for doing a wonderfully posh British accent. That accent became even more classy when Fallon offered the actress a balloon filled with helium.

“I haven’t done this since I was about 11,” Mirren said.

The two then giggled their way through the rest of the interview—complete with an acceptance speech given by Mirren—while under the influence of the helium. No one can accuse this queen of not knowing how to have fun.