Reggie Bush Krashes Kim Kardashian Bash

Some dude crashed Kim Kardashian's 28th birthday party Saturday night - her actual birthday was October 21 - in Las Vegas, but she definitely didn't mind.

No, it wasn't Ray J. She may have objected to that.

Her NFL star boyfriend Reggie Bush, whose New Orleans Saints played without him in London as he recovers from knee surgery, popped in unannounced!

Kim Kardashian, sisters Khloe and Kourtney, pal Robin Antin and others, were partying in a hotel room at the Luxor on Saturday night when the doorbell rang just a half hour before they were to head down to the nightclub LAX.

When Kim opened the door, there stood Reggie Bush, who the Saints coaching staff had given the OK to fly to Vegas at the last minute. OMG! So cute.

WHAT A SAINT: Party krasher Reggie Bush kozies up to Kim Kardashian.

On her actual big day, Kim was in the hospital with Reggie, who had surgery that morning. So it's only fitting that the running back returned the favor.

Of the special birthday surprise, Kim told E! Online, "We had the best time! It was a birthday I will never forget. He wins the best boyfriend award!"