Most fans just want your autograph and possibly to have their photo taken with you.
But when this toddler took a shine to Katherine Jenkins, he showed it by ruffling her impeccable hairdo.
The little boy chuckled cheekily as he made a lunge for her hair, grabbing a fistful of her golden locks, which were styled into a beehive.
Fortunately the Welsh mezzo-soprano saw the funny side bursting into laughter during the incident at a promotional event for Believe, her seventh studio album.
She later posed for more pictures with her mischievous admirer, keeping her head at a safe distance.
Photo: © Getty