Weird Couple Alert: Things are getting sexy in “The City” for MTV reality star Whitney Port. Lauren Conrad’s former right-hand woman has reportedly been secretly dating silver screen hunk Leonardo DiCaprio, 34, for several weeks, Big Apple tattles have revealed to Star.

“They met at an NYC party and he flirted with her like crazy, then asked for her phone number,” says a Whit pal, who asked not to be identified. “She didn’t think it was a big deal because she heard he does that with a lot of girls.”
According to a report in the tabloid’s Oct. 26 issue, the Manhattan-based Whitney has been racking up the Frequent Flyer Miles with several recent trips back to her hometown of Los Angeles, where she’s been busy making clandestine visits to Leo. Their official first date was at the Oscar-nominated actor’s lavish mansion in the Hollywood Hills.

“When Leo started calling her, she thought he was just being friendly, but he called and called,” the Star insider dishes. “He was very sweet to her. He told her how beautiful she is, how much he wanted to go out with her….He’s treating her very well, and of course it’s exiciting that he’s such a hugh star.”

Whitney, 24, previously dated businessman Freddie Fackelmayer and rocker Jay Lyon, but she’s very overwhelmed all the attention she’s getting from the Titanic star — formerly romantically linked to catwalk stunners Gisele Bundchen and Bar Rafaeli.

“She’s really clicked with him, but she’s taking it very slowly. She doesn’t want to be just another notch on Leo’s bedpost.”