The finalist told Heat that he fancied 22-year-old Sianad Gregory, who he danced with in the third week of the live shows.
Murs said: "[She's got] nice long legs - she's really hot. That was my favourite dance, because both girls were unbelievably hot and dressed in witches' outfits.
"It was a bit kinky. They were pretty tasty. She doesn't know [I fancy her], but when she reads this she will."
Gregory is an actress who has appeared in Casualty and the James Corden and Mathew Horne movie Lesbian Vampire Killers.
Murs has previously been romantically linked to fellow finalist Stacey Solomon, but her mentor Dannii Minogue has rejected the suggestion.