Ross pressed McKellen, 73, on how he is legally equipped to marry Stewart, who plays the wheelchair-bound Professor Charles Xavier in the Marvel movies, and his fiancee, jazz singer Sunny Ozell.

“I don’t know,” McKellen said. “But in Massachusetts, in the middle of America somewhere, you get a friend along, and I read out the words, and Sunny and Patrick will then be married. … I’ve done it once before with two guys having a civil partnership. I was crying my eyes out.”

Massachusetts' Secretary of Commonwealth offers a service that allows a family friend or relative to perform a couple's wedding ceremony for a one-time fee of $25.

Asked what he might wear to the happy event, McKellen replied that the last time he officiated, he wore "a white gown which I bought in India. You mustn’t upstage the bride.”

Stewart, 72, has been romantically linked to Ozell, 35, since 2009.

Both he and McKellen will reprise their X-Men roles in flashback scenes in the upcoming prequel, X-Men: Days of Future Past.