Kournikova 'involved in club argument'

Anna Kournikova has reportedly been involved in an altercation at a Las Vegas party.

According to conflicting US reports, the former tennis star became embroiled in an argument at Lavo nightclub on Saturday night after an unknown female confronted her in the VIP area.

"The woman came back over [as she was leaving the club] and threw a drink on Anna and her assistant. The woman was definitely drunk," an onlooker told People.

The insider went on to allege that a scuffle then broke out and Kournikova was pushed against a wall before security arrived, adding that she "looked really shaken up" following the incident.

However, a second source told Radar Online that "there were no blows" and described the alleged argument as "more of a screaming match".

A representative for Kournikova has yet to comment on the report.