Luann de Lesseps seems to be enjoying her time with Olivier Sarkozy! According to insiders close to The Real Housewives of New York City alum, 58, she’s been having fun getting to know Mary-Kate Olsen’s ex-husband, 54. “Luann’s a huge flirt,” a source spilled about de Lesseps after the two were seen on a date. “She likes to have a good time, and it certainly looked like she was doing just that with Olivier.” “They’ve known each other socially for a while and share many friends,” the insider explained of their connection. “She’s single, he’s single, the timing was right.” “She appreciates that …