Christina Aguilera -- Plump $3 Million Offer from 'BIG' Women Dating Site

EXCLUSIVE

Christina Aguilera's Rubenesque physique could pay off in a huuuuge way -- TMZ has learned she's been offered $3 MILLION to be the face of a dating website for "big and beautiful" women.

The person behind the offer is former "America's Next Top Model" winner Whitney Thompson -- the first plus-size model to even win the show.

Whitney now runs TheBigandTheBeautiful.com -- and fired off a letter to Aguilera, saying she's extremely interested locking down Christina as the spokesperson for the website, which is "specifically designed for women with curves."

As part of the deal, Aguilera would agree to at least one TV commercial, one radio commercial, two photo shoots, and four public appearances. Shealso wants Christina to sing a jingle for the website.

Christina has previously said she's proud of her new "curves," but it's unclear yet if she's too proud to take the money.