Even though it was 18-year-old Natali's special day, the eccentric pop star stood out from the proud family members as she arrived in a typically flamboyant outfit.

Perhaps feeling headwear envy at her sister's mortar board, GaGa hid her face under a black conical hat draped in a long lace scarf.

Standing out from the crowd: Lady Gaga wears a nude, lace bodysuit, black veil and platforms as she attends her sister's high school graduation in New York

While the 24-year-old was more covered up than normal, she still managed to show off a bit of flesh with a sheer, lace bodysuit and those famous heelless platforms.

GaGa, real name Stefani Germanotta, was spotted checking her mobile phone outside the Convent of the Sacred Heart in Manhattan's prestigious Upper East Side yesterday before being whisked away in a chauffeur-driven car.

The singer, who grew in a duplex apartment nearby, attended the private Roman Catholic school until she was 17.

Flamboyant: GaGa wore a risque nude and lace bodysuit at the formal event

Gaga's younger sister Natali is hoping to follow her sister into the music world and has already starting lessons with a top vocal coach, paid for by her sister.

But their parents Joseph and Cynthia Germanotta have encouraged Natali to complete her education first.