Blake Lively, 29, makes rare appearance with her half-sister Robyn, 45, as they bond during vacation on Long Island

Blake Lively was spotted on Sunday strolling down a sunlit tree-lined Long Island sidewalk alongside her elder half-sister Robyn Lively, 45.

Both of them - blood related by way of their mother Elaine Lively - had slid into skintight pairs of dark jeans that played up their taut legs.

Her blonde hair slung over one shoulder, 29-year-old Blake had buttoned herself into a white blouse and accessorized with Jennifer Meyer yellow-gold necklaces.