The singer-and-actress - who got engaged to NFL player Eric Johnson on Thursday (11.11.10), six months after they started dating - has reportedly angered her father-and-manager Joe by her refusal to draw up an agreement detailing how the couple`s assets would be divided if they separated.
A source said: "At the moment, Joe is sitting back and being a great father supporting his daughter and his future son-in-law.
"However, you can bet after all the excitement has died down, Joe is going to do everything in his power to make sure Jessica doesn`t walk down the aisle until Eric signs away any right he might have to Jessica`s enormous fortune."
Friends of the 30-year-old star - who has an estimated wealth of around $100 million - are said to be particularly concerned about her decision not to make Eric sign a prenuptialagreement because she also refused to make a similar agreement when she married Nick Lachey.
When their divorce was finalised in June 2006, Nick walked away with a substantial amount of her finances.
The insider told website PopEater: "Nick walked away with over $10 million of her money when they divorced, because they had no prenup. You would think she would have learned her lesson. But where romance is concerned, Jess` follows her heart not her head."
Joe recently took to twitter to congratulate her on her engagement.
He posted: "So very happy for Jess and Eric. May they have a lifetime of joy and happiness."