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George from Seinfeld was in Philly last night

Diana Ross performed and Jason Alexander hosted at a party at the National Constitution Center.

In one of the odder celebrity pairings we’ve seen lately, Einstein Healthcare Network invited Diana Ross and Jason Alexander to the first event in their year-long150thanniversary celebration. The sold-out party took place last night at the National Constitution Center.

Alexander hosted the event, which culminated in a performance from Diana Ross singing her hits, including “You Can’t Hurry Love” and “I Will Survive.”

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Click through the slideshow to see the celebrity meet and greet andparty guests.