The NFL is investigating possible trademark infringement involving five players who appeared in an ad for a party at a Miami Beach nightclub.

The party also included appearances by porn stars, the Kansas City Star reported yesterday.

Eric Berry and Brandon Flowers were shown in their Chiefs uniforms as two of the hosts at the party May 20. The event was advertised as the official launch for Exxxotica, an adult-themed expo in Miami.

Also pictured on the flier were Texans cornerback Kareem Jackson, Raiders wide receiver Jacoby Ford and Bears safety Major Wright, and six photographs of the porn stars.