Blake Lively in Vogue Photos

Izzie lies with Denny even after he passed away, while her dismayed intern cohorts can only look on.

Izzie arrives for the prom, but receives the worst possible news.

Denny Duquette, in all his glory.

Izzie visits a former patient and current fiancee.

Bailey tends to the famous heart transplant patient.

The balloon, that is. You know, for the party. They are inflated with helium.

Izzie's face shows confusion.

Dr. Webber is looking good.

Derek suddenly feels the need to be with Meredith. Alone.

Meredith hints that Finn might get to first base after the prom!

Meredith, Addison and Derek bid farewell to Doc.

Nothing. Literally. He died!