Jessica Simpson's fiance Eric Johnson is in it for love -- not money.
Slamming a tabloid claim to the contrary, a source close to the engaged couple tells UsMagazine.com that Johnson, 31, "is not a gold digger."
Exhibit A, the source points out: "There will definitely be a prenup" for the pair. "Jessica has said she wants one. Jessica and Eric have talked about it," the source tells Us.
Indeed, there's a lot of dough at stake: The Jessica Simpson fashion/accessories brand grossed about $750 million in retail in 2010 alone.
"[Eric] understands that there needs to be a prenup," the insider explains. "He's supportive of it."
After dating for less than six months, ex-NFL pro and Yale grad Johnson popped the question to Simpson, 30, on Nov. 11.
"He really loves her," the source continues. "He's a low key guy. He's not into the glitz and materialism of Hollywood at all."
VIDEO: Jessica shows off her $150,000 engagement ring
The singer-turned-mogul herself gushed about her husband-to-be to Us last week. "Every day is a romantic day with him," Simpson said at the Rockefeller Center Tree Lighting bash in NYC. "I'm very blessed."