Stella McCartney, daughter of music royalty Paul and a rock star in her own right among fashionistas, has just purchased a modest $1.5 million cottage on Amagansett. She and hubby Alasdhair Willis, the creative director of boot brand Hunter, reportedly plan to drastically expand the small cottage to accommodate their six-deep brood, which includes their four children between the ages of 11 and 16.

As of now, the bay-view home includes three bedrooms and two bathrooms in its 1,350 square feet of living space atop about three-quarters of an acre of beachy scrub.

Honey blond floors, nautical light fixtures and vaulted ceilings with white beams are joined in the combination living/dining room by a trio of glass sliding doors that open onto a wide, north-facing deck with views of Napeague bay and the southern tip of Gardiners Island. The modest kitchen has shaker cabinets and Formica countertops, while the house also includes a brick chimney and plenty of outdoor entertaining space.

McCartney operates 17 freestanding clothing stores worldwide, and her collections are distributed in over 50 countries through more than 600 wholesale accounts including department stores and specialty shops. In 2001, she was named VH1/Vogue Designer of the Year, and in 2013, the BBC named her one of Britain’s 100 most powerful women.

She and Willis also own a townhouse in London’s Notting Hill neighborhood and a 160-acre countryside estate in Worcestershire. They’ll be joining Stella’s father as Hamptons residents. Sir Paul maintains a modest Amagansett home he purchased in the late ‘90s for around $500,000.