"American Idol's" Pia Toscano has not only reportedly dumped her long time boyfriend for Mark Ballas of "Dancing with the Stars"...  but she there are reports she hasn't even bother to tell him he's history.

The New York Post  reports Pia didn't even bother to break up with boyfriend, Queens Caterer Carlos Nunez,  before going out on a dinner date with Ballas two days after being eliminated.  A mutual friend of the couple says the break up seems inevitable.  Pia apparently has had very little time for Nunez since making the final 12.  Sadly, the story indicates Nunez has been very supportive of Pia's ambitions.