George Takei & Brad Altman Beaming Up To Sunday Wedding

‘Til death do us part — or live long and prosper? Either will do on Sunday, as George Takei, best known as Mr. Sulu on “Star Trek,” prepares to marry his longtime partner, Brad Altman.

“We’ve been living in sin for the past 21 years,” George, 71, told People. “It’s high time we made it legitimate.”

While George told People his mood was “nervous-ville,” Brad, 54, sounded anything but.

[ Access Extended: George Takei Gets His Marriage License - Play it Now ]

“This is going to be the most exciting day of my life,” he told the mag. “I’m going to be married. I’m the luckiest guy in the world.”

The couple will reportedly wed Sunday evening in downtown Los Angeles.

While George has had a long career in film and television since his “Star Trek” days, including a recent role on “Heroes,” he’s still close with several of his “Trek” co-stars. Walter Koenig, who played Chekov, will serve as best man, and Nichelle Nichols, who played Uhura, is also in the wedding party.