Jessica Simpson may have earned billions from her fashion business but that does not mean that the singer-turned-entrepreneur has not made any financial mistakes in the past. In fact, the marriage to Nick Lachey could be her biggest financial blunder, Simpson said in her latest interview.

The “Blonde Ambition” actress stopped by CNBC’s “Closing Bell” on Thursday, where the show host Kelly Evans asked what her biggest money mistake was.

“The biggest money mistakes? I don’t know. For some reason I thought of my first marriage!” the businesswoman answered, according to E! News.

Simpson married fellow singer Lachey in 2002, after which they bagged the MTV reality show, “Newlyweds: Nick and Jessica,” based on the happenings of their married life. The show aired from 2003 to 2005, when the couple separated and later divorced in 2006.

According to The Washington Post's Emily Yahr, Simpson called her former marriage to Lachey her “biggest money mistake” because she had to shell out a large sum from her income to Lachey after their divorce, as there was no prenuptial agreement.

Simpson's net worth at the time of her divorce was $35 million; as opposed to Lachey, who earned $5 million annually. The law required them to divide their income equally but TMZ reported at that time that Lachey settled for “considerably less” than half of their combined earnings to avoid any court battle. However, Simpson's latest comments could prove otherwise.

Simpson is now happily married to former NFL player Eric Johnson and the couple has two kids together. She launched her Jessica Simpson Collection in 2005, which has now grown into a billion-dollar business and includes clothes, handbags, home decor and fragrances.

The 35-year-old trusts her business manager blindly for all her financial decisions and says she “is all about taking a risk” in expanding her professional horizons. "I always say I'm ready for another billion," she concluded.