The 'Someone Like You' hitmaker has been requested to perform at parties for supermodel Kate and the US first lady in January, but as they are a day apart, it is likely she will only be able to perform at one.
A source told the Daily Star newspaper: ''Kate's 40th is on January 16 and Michelle's 50th is the day after. Moss asked her team first to find out how much it would cost to get Adele to perform.
''But Michelle then also invited her to sing alongside Beyonce at the White House.
''With Adele's fees she could make £3 million in 72 hours if she flies from Kate's to the States.''
Adele has not performed in public since singing James Bond theme 'Skyfall' at the Oscars in February, but she has sung at private events, which can prove very lucrative. South African tycoon Vivien Imerman reportedly tried to book her in March for his daughter's wedding, and Adele's people asked for £100,000 a minute or £2.5 million for a 25-minute set.