The British pop star is reportedly dating Sophia Smith, who attended St Peter's Collegiate School with him in his native Wolverhampton, England.
Smith reportedly joined Payne's family on a trip to see the star in Los Angeles last week (begs12Aug13).
A source tells Britain's Sunday Mirror, "Liam has really fallen for her. It's getting very serious, very fast."
The 19 year old has been single since splitting from girlfriend Danielle Peazer in May (13).