Rumor has it that Britney Spears and hubby Kevin Federline marriage is rocky again, after on-lookers witnessed them fighting again last Friday.
Britney had failed to appear and support Kevin's album listening party Friday night.

They arrived with their seven-month-old son Sean Preston in Las Vegas, Nevada, last week, ahead of "want-to-be" rapper. Federline's party was held at the Pure nightclub at the Caesar's Palace.

The Las Vegas Review Journal reports the couple were spotted arguing in Caesar's Nero restaurant ahead of Federline's bash and Spears retired to their hotel suite in tears, according to Yahoo! UK.

Federline performed two songs, America's Most Hated and Rockstar from his new album 'Playing With Fire', without his wife present. Mrs. Kathy Hilton (Paris Hilton's mother) introduced Kevin's performance.

Several hundred fans came to Federline's gig, as well as many of his friends, former Fresh Prince Of Bel Air actress Tatiana Ali and Mr.Rick Hilton - but Brit was nowhere to be found.
Source: Yahoo! UK & Ireland News