EXCLUSIVE: Read it here first...

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Jessica Simpson, Do Not Read This!

Tue., Sep. 22, 2009 4:00 PM PDT by Marc Malkin

Todd Williamson/Getty Images

If being single and losing her dog to a coyote weren't bad enough for Jessica Simpson, she now has to find out her ex-husband is getting back together with his ex-girlfriend.

Nick Lachey and Vanessa Minnillo have been on a total PDA parade for the last three days (and nights!) in Las Vegas...

On Saturday night, the two checked out singer Matt Goss' new show at the Palms Casino Resort. (Side note: Kim Kardashian was there the night before and even got on stage to sing and dance with Goss.)

Nick and Vanessa were later seen partying and dancing until the wee hours with Wilmer Valderrama at nightclub LAX.

No word if they were hurtin' hard the next morning, but on Sunday they watched the New York Giants game against the Dallas Cowboys (you know, Tony Romo's team) at First Food & Bar inside the Palazzo.

They obviously liked First Food & Bar. They returned last night to watch Monday Night Football and dine on Grandma's Pizza and ice cream sandwiches.

Yum.

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See who else has been in Sin City recently in our Party Pics: Vegas photo gallery.