Khloé Kardashian isn't "bad" enough for her new beau, his ex has reportedly claimed.

The reality TV star is thought to be enjoying a fledging romance with basketball hunk James Harden, with the pair spotted partying together in Las Vegas over the July 4 weekend.

James previously dated rapper Trina, who also counts French Montana - Khloé's previous boyfriend - among her exes. She is said to be less than impressed about the new romance.

"Trina has been telling her friends Khloé can continue to have her sloppy seconds once again. Trina still hasn't spoken to Kim [Kardashian] since Khloé and French got together and you know they were good friends. Trina says Khloé may be the baddest of the Kardashians but she'll never be her," an insider told Us Weekly.

Trina appeared to show her disdain for the new couple via Twitter over the weekend. Yesterday she posted a simple message alongside an emoji of someone with their tongue sticking out: "Sloppy seconds .." it read. She later added: "Las Vegas .." as she was in the city hosting a party.

Although the rapper appears to be unhappy about the situation, at the moment it's not thought Khloé and James are completely committed.

"Trina thinks it is funny that Khloé was hanging out with James Harden, another of her exes," the source added. "Remember French Montana was also with Trina before Khloé. Khloé and James are not officially dating though and are just friends hooking up."

The reality TV star and sportsman were seen snuggling up as they enjoyed a dinner over the weekend, then took in Chris Brown's performance at Drai's Nightclub.

It's rumoured the pair have a family connection to thank for getting to know each other. Kim organised a basketball-themed surprise for her husband Kanye West's 38th birthday last month, hiring out the Staples Center for him and his friends to play. James was on hand to give the group some tips, which is said to be when he got talking to Khloé.

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