The opening-night cast also included Bryn Terfel as Scarpia and Marcelo êlvarez as Cavaradossi; Royal Opera House music director Antonio Pappano is the conductor.
Gheorghiu has sung Tosca on film and CD, and performed excerpts at Metropolitan Opera and New York Philharmonic galas. But last night's performance marked her first appearance in a fully staged production.
The production runs through July 8.
Photos by Catherine Ashmore.