The music mogul gushed that the note from his son Eric was his "favourite thing".
The TV judge and his son both plan to wear masks on their forthcoming trip to Disneyland.
The 'X Factor' judge's new look is believed to be down to a vegan diet.
The full line-up for Simon Cowell's latest reality series has been announced.
Guest judge Jay Leno pushed the button to vault the young diva to the live show.
Comedian David Walliams shares behind-the-scenes snap as all-star series 'Britain's Got Talent: The Champions' starts filming.