Nick Lachey is everywhere this week promoting his new CD. The hunky singer is trying to tell anyone that will listen that he has moved on from estranged wife Jessica Simpson and just wants to concentrate on his career. Or is this case more like some fun at The Kentucky Derby with Supermodel Petra Nemcova. The Supermodel said she was excited on her first trip to the Kentucky Derby and she told reporters it was a wonderful experience and she hopes to be back. Extra may have a hint of the reason why she enjoyed her stay in the Bluegrass state. It's an all-new couple alert as "Extra" breaks news about the latest beauty in the life of Nick Lachey. And the sexy temptress isn't keeping this romance a secret! Supermodel Petra Nemcova and the hottie singer were spotting getting super cozy over the weekend at the Barnstable Brown Bash at the Kentucky Derby. The duo arrived solo on the red carpet. Sources told it was Petra who approached Nick at the party and was very hands on. Petra looked stunning at the event.  Will these be another fly-by-night relationship for Nick Lachey or does Petra have what it takes to hold his interest One thing is certain - Nick is trying to give the impression that his attitude towards his ex is "Jessica Simpson - who"