The show snatched the honor from the recent revival of "Cabaret" when it played its 2,378th performance Thursday night.
Set on a Greek island, "Mamma Mia!" is about a young girl who -- on the eve of her own wedding and much to the chagrin of her strong-willed mother -- tries to figure out which of three strangers is her long-lost father.
The stage musical of "Mama Mia!" is playing at Manhattan's Winter Garden Theatre.