Rob Kardashian may soon be Dancing with the Stars, but an insider says he's currently angering his famous sister.

the Kardashian family's least famous famous sibling is shacking up with Dollicia Bryan, a [video model] rumored to have slept with Reggie Bush while the running back was dating Kim.

Bryan denies any affair took place, but she did take Kardashian to task in last July's issue of King (above), telling the magazine:

"We’re two different women. I’m a mother, so I can never be famous for leaking a sex tape... there’s a huge difference between us. I’ll stay the Queen of talent and acting, but as far as being the Queen of who I’m dating and being in the media all the time; she can stay the Queen of that."