Lori Loughlin Files for Divorce from Husband Mossimo Giannulli – What the Prenup Reveals

One detail buried in years-old paperwork could prove more important than the couple's public history together, and a later change to that agreement raises an even bigger question about what each of them may ultimately walk away with.

After months of separation, Lori Loughlin has officially taken the next step in ending her nearly three-decade marriage to Mossimo Giannulli. Yet buried in the divorce paperwork is a financial detail dating back almost as far as their relationship, and it could have major implications for how the split unfolds.

According to TMZ's September 8 report, the "Full House" actress filed for divorce months after she and Giannulli separated and began living apart.

Loughlin listed August 31, 2025, as their date of separation and cited irreconcilable differences. The filing also confirms that the pair entered into a prenuptial agreement, while the question of support is expected to be addressed later.

The couple married in 1997 and share two daughters, Olivia Jade and Bella. Their divorce makes official a breakup that follows an unusually eventful marriage, including the college admissions scandal, prison sentences, and years of public scrutiny.

While those chapters generated plenty of headlines, the financial agreement behind their marriage may now prove just as significant.

A Marriage That Had Already Been over for Months

By the time Loughlin filed, the couple's separation was hardly a secret. They had reportedly been living apart for several months, and insiders had already described the actress as deeply affected by the collapse of the relationship.

A source previously told Us magazine that people close to the couple knew they had been going through "a really hard time in the last year." "This isn't a shock to people around them," the insider said. "It has been a rough time for Lori."

The source went even further about their future, declaring, "They will not reconcile, there is currently no chance, and will ultimately divorce [sic]." That prediction has now materialized. Loughlin's filing comes after nearly 30 years of marriage and also follows the sale of the couple's Hidden Hills mansion for $12.65 million late last year (2025), according to TMZ.

Shortly before the divorce filing, Loughlin also returned to Instagram with a video carrying the caption, "Here's to things working out." Now, however, attention is shifting from the emotional end of the marriage to what could happen financially.

The Prenup Was Signed Before Their 1997 Wedding

The divorce documents finally provide a clearer timeline for the agreement at the center of the split. According to Page Six, Loughlin confirmed that she and Giannulli signed their prenuptial agreement on October 28, 1997, roughly one month before they married. But there is another wrinkle: The agreement did not remain untouched.

The prenup was amended on August 11, 2015, about five years before Loughlin and Giannulli pleaded guilty in connection with the college admissions scandal. The details of exactly what changed in that amendment were not specified in the information provided.

Still, Loughlin's requests in the divorce filing offer an important clue about how central the agreement could become. She asked that their properties, assets, and debts be divided according to the terms of the prenup.

Loughlin also requested that spousal support be determined later and asked for Giannulli to cover her attorneys' fees and costs. Those requests become particularly interesting when viewed alongside earlier reporting about what the original agreement allegedly contained.

The Original Agreement Reportedly Kept Their Fortunes Apart

Months before Loughlin officially filed for divorce, TMZ reported on the couple's prenup and cited sources with direct knowledge of its terms.

According to those sources, the agreement signed in 1997 designated the couple's assets as separate property. TMZ reported that Giannulli had insisted on the prenup before the wedding.

That detail becomes especially significant because of what his financial position reportedly looked like at the time.

According to TMZ's sources, Giannulli was worth more than $100 million when he married Loughlin. If those original provisions remained intact after the 2015 amendment, the agreement could sharply limit any claim Loughlin might otherwise have to wealth associated with Giannulli. That possibility was already generating questions when the pair first separated.

TMZ noted at the time that it was unclear how the agreement had changed, if at all, but the basic premise of the reported original prenup was striking: what belonged to each spouse would largely remain that spouse's property. And another source offered an even more pointed assessment.

'The Prenup Does Not Benefit Her'

When news of the couple's separation emerged in October 2025, an insider speaking to Us did not mince words about what the agreement could mean for Loughlin:

"He is still worth a lot of money and the prenup does not benefit her."

The insider added, "Lori is so nice and does not have a vindictive bone in her body." At that stage, both Loughlin and Giannulli had reportedly retained legal counsel and were moving toward divorce proceedings, although they were still publicly describing the breakup as a separation.

The reported terms of the agreement stipulated that their premarital assets would remain separate property. That may matter considerably because the fortunes each brought into the marriage were reportedly very different.

Their Financial Histories Add Another Layer

Estimates of Loughlin and Giannulli's wealth vary considerably depending on the source and whether their assets are counted individually or together. Parade reported that Loughlin's estimated net worth in 2026 is $80 million, although that figure is presented as a combined net worth with Giannulli. Celebrity Net Worth was cited as the source for that estimate.

By contrast, Forbes reported in 2019 that Loughlin's individual net worth was approximately $8 million at the time. Other estimates have placed the couple's combined fortune between roughly $70 million and $88 million.

Giannulli accumulated much of his wealth through the Mossimo clothing brand, which became a major name during the 1990s.

The brand later entered a high-profile retail arrangement with Target. A Los Angeles Times report documented the company's business trajectory during that era, while Giannulli later sold the brand to Iconix Brand Group in 2006. Against that financial backdrop, the prenup's separate-property provision takes on much greater significance.

Their Marriage Survived a Major Public Scandal

The pair's relationship had already endured extraordinary pressure before their eventual separation.

Loughlin and Giannulli became two of the best-known figures caught up in the college admissions scandal after prosecutors accused them of paying $500,000 to Admissions Fixer Rick Singer in connection with their daughters' admission to the University of Southern California. Both ultimately pleaded guilty to conspiracy to commit wire and mail fraud.

Loughlin received a two-month prison sentence, while Giannulli received five months. Us magazine reported that the couple also paid a combined $400,000 in fines as part of their sentences.

According to TMZ's 2025 reporting, Loughlin had hoped Giannulli would make changes after they were released from prison, but sources claimed that did not happen. The actress was said to be "devastated by the separation" and disappointed in him.

Their daughters, however, were reportedly less surprised by the breakup. A source told Us that Bella and Olivia Jade had noticed changes in their parents' dynamic during the previous year.

"They had seen the way their parents were interacting in the last year and knew this was coming," the insider said. "It was not a shock to anyone in the family." The source also characterized the family's transition as more of an adjustment than a sudden disruption.

John Stamos Publicly Defended Loughlin

Loughlin also received a particularly outspoken show of support from her longtime "Full House" costar John Stamos after the separation became public. Speaking on the "Good Guys" podcast in October 2025, Stamos said he had known Loughlin for four decades and described himself as heartbroken for her.

"This woman's a saint," Stamos said. He also leveled harsh criticism at Giannulli, calling him a "terrible narcissist."

Stamos said he had tried to support Loughlin both through her marital problems and during the college admissions scandal.

"I'm not going to debate whether she had much to do with it or not," he said. "I know she didn't. She's not a liar. She's a saint."

Giannulli did not provide a comment to TMZ when the outlet previously contacted him regarding the couple's separation and prenup.

What Happens Next Could Come Down to the Fine Print

For now, several important financial questions remain unresolved. The divorce filing establishes that a prenup exists, confirms that it was amended in 2015, and makes clear that Loughlin wants property, assets, and debts handled under that agreement.

But without the full terms of the amended document, it is not yet clear precisely how the couple's wealth will ultimately be divided. That distinction matters.

The original 1997 agreement was reportedly designed to protect separate property, and sources previously claimed it favored Giannulli financially. Yet the later amendment introduces a major unknown into an otherwise seemingly straightforward arrangement.

Meanwhile, spousal support has not yet been settled, and Lori Loughlin is asking that Giannulli pay her legal fees and costs.

After nearly three decades together, the couple's divorce may therefore come down not simply to what they accumulated during the marriage, but to exactly what they agreed to on paper years before anyone imagined the marriage would end.