Dancing With The Stars by Kelsey McNeal/WireImage.com
Things on the Dancing with the Stars dance floor get hot, but is the romantic beat going after-hours for Mario and partner Karina Smirnoff? The NY Post is reporting that the pair were seen smooching (!!) outside the Four Seasons hotel in L.A.

A source says, "They were making out by the valet with their hands all over each other, and he was whispering in her ear. It was around midnight, so there weren't many people around."

Smirnoff, who is publicly dating her former DWTS partner, Mario Lopez, denies the rumor. Her rep says that the two "have a completely professional relationship." Mario's rep also denied the claim, telling Us, "This did not happen."

Mario, however, has hinted at his attraction to Karina, as well as at his view of Dancing as a potential hotbed for intra-cast hooking up. In this Mega Minute video, he talks about his fondness for Karina (at the 1:30 mark) as well as DWTS' propensity for backstage hookups (2:10):

What do you think of the rumor? Is Mario and Karina's on-camera chemistry feigned, or is it the real deal? - Anna Dimond