Stella McCartney's fun glasses

(BANG) -

Stella McCartney thinks women need two pairs of sunglasses.

The designer has launched her own collection of eyewear in a collaboration with Luxotticaand believes it is important for the accessory to give off a sense of fun.

She said: "Women have two sets: a classic pair they'll have forever, and a more playful pair. We've added that fun element to the line.

"My mum had this mad pair with Christmas trees on them that I loved when I was little. Sunglasses are one of the only accessories that can really have a sense of humour. But you walk a fine line between looking like a complete idiot and getting it just right."

Stella celebrated the launch of her collection with a late-summer party on the final day of her pop-up shop at seasonal gallery the Fireplace Project in East Hampton, New York.

Guests - including the designer's husband Alasdhair Willis and father Paul McCartney, Gwyneth Paltrow, Naomi Watts and Live Schreiber - tucked into vegan canapes including corn and black bean pie, veggie burgers and cookies, while their children were entertained by pink piñatas and an animal petting area.

Proceeds for any stock sold during the event were donated to the Pollock-Krasner House and Study Center.