American singer Beyonce Knowles was refused entry to an exclusive London club on Monday night (14AUG06) - by police investigating a fatal stabbing. The former DESTINY'S CHILD frontwoman, who is in the British capital promoting new single DEJA VU, enjoyed a meal at Nobu restaurant before heading to Kabaret Prophecy. But the hotspot was sealed off by police after a 24-year-old man was stabbed to death after being ejected from the nightspot for fighting. The victim was attacked as he walked away into London's busy West End. A spokesperson for the club, which is a favourite haunt for Madonna and Prince, says, "Neither of the clientele had been seen in the club before. "Security were satisfied the fight had been stopped, but unfortunately it continued."