Two trendy Las Vegas clubs have been put on notice for allowing celebrity Paris Hilton’s underage boyfriend into their establishments on New Year’s Eve.

Tao Asian Bistro in the Venetian and Body English at the Hard Rock Hotel received warning letters last month from the Clark County Business License Department after investigators determined that Stavros Niarchos, 19, had been allowed into the clubs.

Both clubs were told they had violated county code but were not issued citations because operators had cooperated with county agents, the letters said.