Before there were Kardashians with whom to keep up, there was Sean Duffy and fellow castmates of “The Real World,” MTV’s proto-reality franchise launched in 1992.

“The Real World” collided with the actual real world  Tuesday  when alums of the network’s reality shows turned up on Capitol Hill to help Duffy, now a congressman from Wisconsin, launch the Ovarian Cancer Caucus.

Apparently, the MTV alumni club is a bit mafia-esque — when something bad happens to one member, everybody takes it personally. The gang — Duffy, his wife Rachael Campos Duffy (“Real World San Francisco” and “Road Rules: All Stars”), David “Puck” Rainey (her bad-boy castmate), Norman Korpi (“Real World New York”), Derrick Kosinski (“Road Rules”)  and Laurel Stucky “The Challenge”) — were on the Hill to honor Diem Brown, the MTV-show veteran who died of ovarian cancer last year.

At an event announcing the new caucus alongside ovarian cancer survivor Rep. Rosa DeLauro (D-Conn.), Duffy said Brown’s death “touched our MTV reality-TV family.”

“She didn’t choose to hide, she chose to share … her fight,” he said.

And even though Rainey is considered one of reality TVs biggest villians (he clashed with his housemates and had a stormy, it’s-complicated friendship with Campos), he was back in the fold  Tuesday, posing for pictures and cheering during the program.