Jay Z has an ultimate fan moment in the audience at a Beyonce show

Beyonce, meet your number-one fan.

The 34-year-old singer's incognito husband sneaked into the audience at her headlining Budweiser Made in America concert and proved his spousal support by singing along to her hit '1+1'.

Watch Jay Z nailing the words to his wife's song and jamming to another of her hits in the video above. Look out for pop hottie Nick Jonas, 22, sitting beside him.

Eagle-eyed fans spotted the enthusiastic 45-year-old rapper and posted smartphone videos of him showing out in the crowd. Clearly a hoodie isn't enough to hide the identity of certain A-listers.