J.crew president and creative director Jenna Lyons and her artist husband, Vincent Mazeau, are in the middle of a messy divorce after splitting in the summer.

Multiple sources tell Page Six that Lyons — who is one of America’s most respected fashion businesswomen, earning around $5 million a year working with CEO Mickey Drexler at First Lady Michelle Obama’s favorite fashion retailer — is going through a bruising battle over her millions and custody of their young son, Beckett.

ALL ABOUT JENNA LYONS

The divorce comes after the couple, who wed in 2002 and shared a Park Slope brownstone, were featured in magazine stories as the ultimate in creative and casual cool. But following the split, we’re told Lyons has fallen in love with another woman who also works in the fashion business.

A source told us Vincent is seeking the house and a sizeable settlement in the divorce, arguing that he gave up aggressively pursuing his career as an artist to stay at home and allow her to develop her successful career. But a friend of Lyons said she supported Vincent as an artist, bought him a studio and gave him a life where he didn’t have to work every day.

Lyons — who’s well known for her sense of style and once even gave Oprah Winfrey a tour of her closet — Mazeau and their young son have been photographed by J.Crew for its catalog and Web site. In April, a catalog photo of Lyons, where she was seen painting her son’s toenails neon pink, ignited a scandal that was dubbed “Toemaggedon” by Jon Stewart.

The couple are believed to have reached a custody agreement and are ironing out a settlement in which Mazeau may keep the house, which has been featured in Domino and Livingetc magazines.

A J.Crew spokesperson said, “We do not comment on our associates’ private lives.” Mazeau didn’t get back to us.