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-long 150th anniversary 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 and party guests.