03/28/2008 at 12:00 AM EDT
Dancing with the Stars
pro Karina Smirnoff
is brushing off rumors of a romance with her partner, R&B singer Mario
The New York Post
's Page Six reports
Smirnoff -- who has been dating her former DWTS
partner Mario Lopez
-- was spotted kissing the other Mario at a Mercedes-Benz Oscar viewing party at Four Seasons hotel in Los Angeles in February.
But Smirnoff is laughing off the speculation. "I told you to keep it on the DL, dude," she joked with Mario when asked about the rumors by PEOPLE after Monday's show. Continued Smirnoff: "Did you keep that window open? By the end of the show, I will be pregnant with Mario's baby!"
Mario, 21, added of Smirnoff, 30, "I love this woman! I love her personality! I've grown to love the person that she is, and you should feel that way about your partner!" Responded Smirnoff: "Is that all it is?"
A rep for Mario (the singer) says: "They're not dating."
And a source close to both of the dance partners says that Smirnoff’s relationship with Mario Lopez, 34, is still going strong. "They're totally boyfriend and girlfriend," the source tells PEOPLE. "They went out to Eva Longoria
's restaurant Beso opening together."
Instead, the source attributes the romance rumors to the dance partners' chemistry. Says the source: "They have fun together." --Brian Orloff, Reagan Alexander and Tiffany McGee