The Spencer twins gain a model sibling

LONDON’S most stylish twins have been joined by a new man about town — and he’s very dashing.

Princess Diana’s 29-year-old nieces, Lady Eliza (left) and Lady Amelia Spencer (right) attended a cocktail party at Langan’s Brasserie in London with their half-brother, Samuel Aitken, 19.

He’s the son of their mother, Victoria, and her second husband, businessman Jonathan Aitken. The twins’ own father is Earl Spencer, Diana’s younger brother.

Like his half-sisters, Sam recently moved to London from South Africa, and is a model. He walked the twins’ sister Lady Kitty down the aisle when she married fashion tycoon Michael Lewis last summer.