Jennifer Garner Working on a Prenup Before Marrying John Miller: ‘Relationships Don’t Always Last’ (Exclusive)

Jennifer Garner’s net worth is expected to skyrocket after she brought her organic children’s food company, Once Upon a Farm, public on Friday, February, 6, with the stock price jumping up a whopping 40 percent the very next day.

“Jen is set to be much wealthier than anyone could have ever predicted and true to form, she’s being very pragmatic about it all,” a source tells the National Enquirer. “She’s putting money into long-term investments, planning for her children’s future and making sure everything is structured safely.”

The Once Upon a Farm co-founder, 53, is also figuring out an iron-clad prenuptial agreement for when she finally marries longtime boyfriend John Miller, adds the source.

“The IPO with her company does make things a little complicated because a lot of the money she’s expected to earn hasn’t hit her account yet,” the source explains. “It will take time to build so … the plan is to figure out a prenup that will work.”

Garner has been married twice before to Scott Foley and Ben Affleck, with whom she shares three children, Violet, 20, Seraphina, 17, and Samuel, 13.

“She knows that relationships don’t always last, no matter how much love there is,” says the source, adding that the Alias actress “isn’t going to put her money on the line to marry John, there’s no question about that.”

Fortunately, Miller, who serves as the chairman of tech company CaliGroup, isn’t the type to fight Garner on it, reveals the source. “He’s a proud guy with plenty of money of his own.”