AceShowbiz -

Khloe Kardashian and Tristan Thompson aren't playing around anymore. After spending the past few weeks parading their romance, the "Keeping Up with the Kardashians" star is reportedly now "full-on dating" the NBA star.

"They're taking it slow, day by day, but are having so much fun together," a source close to 32-year-old beauty told ET Online, adding that the pair already knew each other for months. They met at a party and had since talked to each other before they jetted off to Mexico together over the Labor Day weekend last month.

"It's still the honeymoon stages and they both have a huge crush on each other," the source explained and went on revealing that Tristan isn't interested in the "celeb scene" which is apparently why Khloe and her family like him very much.

"He's the nicest, sweetest guy. He comes from a very strong family and has a tight circle of close friends," the insider said. "He really isn't into the 'celeb scene' and does his own thing. He's close friends with [his Cleveland Cavaliers teammate] LeBron [James] and a couple of his teammates."

No matter how smitten Khloe is with Tristan, she's not rushing anything. "She's very happy but taking it slow and not making any rushed judgments," the source continued and added that Khloe is totally over her ex Lamar Odom.

Khloe, who filed for divorce from the former Los Angeles Lakers player for the second time earlier this year, is said to have completely moved on from him. "Lamar is out of her life completely," the source shared. "No animosity there - she still cares about him, she still wants him to be safe, but it's over."