United Kingdom, May 7 -- Cara Delevingne exposed her underwear in a see-through gown at the premiere of 'Ocean With David Attenborough'.

The model-turned-actress took the red carpet in London for the world premiere of Attenborough's new documentary, and Cara turned heads with her eye-catching outfit, which left little to the imagination.

The 32-year-old beauty wore a plunging mesh dress - which was made from fabric that's around 100 years old - for the star-studded event in the UK capital.

The risque dress - which was made in Cairo, Egypt, in the 1920s - exposed Cara's black lacy thong underwear. Cara also skipped wearing a bra on the red carpet, with the actress opting for a baggy black blazer instead.

The runway star - who posed for...