Credit: TGB/Splash News Online; Michael Stewart/WireImage

Niall's secret? One Direction's Niall Horan has been spending some quality time with stunning Victoria's Secret model Barbara Palvin; both 20 years old, the Irish singer and Hungarian model were photographed together in London on Sunday, Dec. 15, leaving the X Factor wrap party at the Marylbone One club. (The catwalker showed off her runway-ready legs in a black minidress and boots, paired with a black leather jacket; the "Best Song Ever" crooner wore jeans, a white t-shirt and maroon varsity jacket.)

The Daily Mail reports that the twosome met earlier this year in the U.S., and had a movie date last month, catching The Hunger Games: Catching Fire in London.

"He's getting to know her," a source close to Horan tells Us Weekly. "The guys have a few months off so they're having a good time before he goes back on tour. He plans on being home for the holidays. She's a nice girl!"

Although his bandmate Harry Styles' love life has made plenty of headlines, Horan's romantic profile has been more low-key -- although he's fessed up to a massive crush on a certain pop superstar. "Who doesn't have a crush on Katy Perry?" he asked recently.