Daddy duty.

Bradley Cooper took his daughter, Lea De Seine, to Taylor Swift’s star-studded pool party at her $17 million Rhode Island mansion Saturday.

According to photos obtained by the Daily Mail, the “Hangover” actor, 49, and his 7-year-old were spotted standing on the balcony of the “Bad Blood” singer’s pricey vacation home.

Cooper, who shares his daughter with ex Irina Shayk, flashed a big smile as he looked at Lea, who had her hands reaching up to her dad’s chest.

The “Maestro” star dressed casually for the outing, wearing a short-sleeved black shirt and holding a black cap in his hand.