Kevin Federline Kevin Federline Shh... Can you hear that?

It's the sound of the Britney Spears/ Kevin Federline rumour mill churning.

And it's being powered by some fresh goss.

Sticky beaks at Kevin's Las Vegas album launch noticed that his good lady wife was nowhere to be seen.

Kev made his way past the press pack alone, before heading into the party - held to celebrate his new CD, Playing With Fire.

Now, it could just be that Britters was at home with baby Sean Preston, couldn't it?

But when you factor in the next bit of info, you might think again.

Local rag the Las Vegas Review Journal reported that the couple were seen arguing in Caesar's Nero restaurant prior to Kev's bash.

May - Britney & KevBritney and Kevin back in 2004Britney was then supposedly spied going back to their hotel in tears...