David Carr was remembered by family and friends Tuesday as an unusual man — managing to shake a years-long crack addiction and reinvent himself into a successful New York Times columnist.

A bagpiper — a nod to Carr’s Irish roots — greeted mourners as they filed into the Upper East Side’s Church of St. Ignatius Loyola to say goodbye to the 58-year-old, who collapsed in the Times newsroom Thursday evening.

One of Carr’s four older brothers, John, described his baby brother as “a unique combination of Minnesota nice and New York energy.”

Dozens of celebrities — including Lena Dunham, Anthony Bourdain and Tom Arnold — crammed into the Frank E. Campbell Funeral Chapel to pay tribute to their lost friend Monday night at Carr’s wake.

Many shared their memories of the blunt yet loving curmudgeon who always managed to put a smile on their faces.

Dunham called Carr “one of my best friends” and shared a story of one of their first encounters five years ago at a Village restaurant, according to The Daily Beast.

“I was a vegan and I didn’t drink, so he took me to the Waverly Inn, where I ate a steak and drank a martini,” she said.

“Then he led me around the whole place, introducing me, saying, ’Please remember this person’s name or you’re going to look like an idiot.’”

The “Girls” star admitted that she later vomited.

Carr’s most recent boss at the Times, Dean Baquet, said at the wake that his untimely death was “heartbreaking.”

Other Times bigwigs, including axed editor-in-chief Jill Abramson, former executive editor Bill Keller and public editor Margaret Sullivan, also stopped by to remember their colleague.

Some of Carr’s buddies from his AA meetings shared how he changed their lives.

One man, who only identified himself as Michael, said he was in a dark place eight years ago.

“I said, ‘OK, if you can make me sober, God, I will accept that the fun is over, my life is over. Just take this despair away from me. I’m fine with no fun,’” he told the Daily Beast.

“And then I met David.”

An autopsy showed that the beloved and revered Carr died from complications from lung cancer with heart disease as a contributing factor. He is survived by his wife, Jill Rooney Carr, and his three daughters — Erin, Maddie and Meagan.

On Monday night, Jill sat at the front of the chapel passing out some of Carr’s spare reporter’s notebooks.

Erin called her dad “a crazy one” and told everyone she already misses him a lot.

“I am so sad that he’s not here. But, good Lord, he would have loved this!”