Michelle Obama Looks Flawless for Final State Dinner

Michelle Obama's going out with a VERY expensive bang.

The First Lady's body was straight fire -- with all due respect -- in a form-fitting custom-made rose gold Versace gown during President Obama's final State Dinner Tuesday night.

Michelle and Barack were hosting the Italian Prime Minister and his wife -- so, maybe she went Versace just to make them feel at home. But more likely ... she just loved the couture.

The evening was topped off with a duet from Gwen Stefani and Blake Shelton.