When Empress Beyoncé chooses you for a duet, you must SING dammit, regardless of Royal status!
The Royal Queen of England's granddaughter Princess Eugenie hit up the O2 Arena Mrs. Carter world tour show recently with Kate Middleton's brother and a few pals, but it seems girl was NOT prepared for what was to come!
During the spectacle, there is a portion when Lady Bey struts around a centrally-located stage singing Irreplaceable and enlists members of the audience to SING "to the left, to the left" with her…
And it seems the Princess was one of those very special people! Although she did NOT seem too pleased!
One alleged insider reveals: