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Lady Gaga — a.k.a. Stefani Germanotta, who appeared at the Academy Awards in a flowing, diaphanous gown — sang a medley from “The Sound of Music” and then greeted original star Julie Andrews, in what was the No. 1 social moment from Sunday’s Oscars, according to both Facebook and Twitter.

“You were amazing,” Andrews whispered into the ear of Lady Gaga, after the latter’s belting performance of the songs, written by Richard Rodgers with lyrics by Oscar Hammerstein. “Dear Lady Gaga,” Andrews said to the audience, “thank you for that wonderful tribute, oh my God. It really warmed my heart.”

Lady Gaga sang the “Sound of Music” songs to celebrate the 50th anniversary of the movie’s release.

Those were a few of the social-sphere’s favorite things.

Per Twitter, that was the top Oscars moment in terms of tweets per minute, followed by Alejandro G. Iñárritu’s “Birdman” win for best picture.

Facebook also said the Gaga-Andrews scene was the No. 1 moment, out of 58 million interactions by 21 million people engaged in the Oscars on the social network globally on Sunday, Feb. 22.

Watch Lady Gaga’s performance below: