Taylor Swift's ex-boyfriend Conor Kennedy was among the protesters arrested on Wednesday (13Feb13) after chaining themselves to the gates of the White House in Washington, D.C.

The 18-year-old son of Robert F. Kennedy Jr. joined demonstrators protesting the construction of an oil pipeline designed to transfer crude oil from Canada to refineries on America's Gulf Coast and found himself in handcuffs, alongside his father and actress Daryl Hannah.

A total of 48 campaigners were arrested outside the U.S. President's official residence.

Kennedy and Swift dated briefly last year (12).

Eco-warriors claim the Keystone Xl project will have disastrous effects on the environment.