Doug buys Paris a $10,000 puppy!

Paris Hilton's hot new romance with Doug Reinhardt just got a little more serious. "Doug bought Paris a $10,000 teacup Pomeranian when they were in Japan recently," reveals an insider. Paris and Doug traveled to Tokyo on Feb. 24 to promote Samantha Thavasa (Paris' sister, Nicky Hilton, designs Samantha Thavasa New York). "We had a great time," Paris told Life & Style outside an LA tanning salon after the trip. Doug doted on her too. "He went with her to all her appearances and shoots and would just stare at her adoringly," says the insider. "He says she's the hottest girl on the planet."

And Paris digs Doug. "She thinks he's really funny and sweet," says the insider. "When she ended her previous relationship with Benji [Madden], she promised herself she'd be single for a year. But she thinks Doug's handsome, generous and fun to be with." Benji was just too boring, says an insider. "He was so strict and controlling and never let her go out," says the insider.