The case of mistaken sexuality....

During her appearance on "Late Night with Jimmy Fallon," this week, Gwyneth Paltrow told of  a bizarre encounter over the weekend with illusionist Roy Horn of Siegfried & Roy at The Cosmopolitan's grand opening.

Paltrow, who is married to Coldplay frontman Chris Martin, said Horn "asked me to lift up my skirt, and then he tried to kiss me on the lips."

Fallon: "You wouldn't have thought Roy would do that."

Paltrow, playing along with it, asked, "What do you mean by that, Jimmy Fallon?"

Searching for words, Fallon offered: "Because he concentrates on magic all the time."