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Ann Oldenburg, USA TODAY

The last time we saw - or thought about - Conor Kennedy, he was kissing Taylor Swift.

Ah, the good old days.

Now the young Kennedy clan member is busy getting himself arrested.

Conor, 18, was handcuffed Wednesday in front of the White House along with 47 other Sierra Club protesters, including his father, Robert F. Kennedy Jr., Daryl Hannah and civil rights activist Julian Bond. They were objecting to the proposed Keystone XL tar sands oil pipeline.

The Kennedys were driven to a Park Police station and released after paying a fine.

"For the first time in the Sierra Club's 120-year history, we have joined the ranks of visionaries of the past and present to engage in civil disobedience ..." said Michael Brune, executive director of the Sierra Club, in a statement after he was arrested with the others. "We cannot afford to allow the production, transport, export and burning of the dirtiest oil on Earth via the Keystone XL pipeline. President Obama must deny the pipeline and take decisive steps to address climate disruption, the most significant issue of our time."

According to the Sierra Club, if approved, the Keystone XL pipeline will boost carbon pollution by triggering a boom of growth in the tar sands industry in Canada, resulting in an increase in greenhouse gas emissions.