While looking for an image of Lex and Lois's wedding online, I stumbled across these sets of photos (let's hope they both show):
Lex and Lois.
Lex and Arianna.
The first thing I noticed was the bow tie was the same; then the trellis, the bouquet, and lastly the dress. You'd think that would be something that Jimmy would have noticed too.
Maybe Arianna only *thought* she had married Lex and doctored the photo to make it seem like it was so.
I also noticed that Ari and Lex's wedding date was almost identical to Lois and Clark's final one (which I believe was Oct. 6th).