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Oscars 2015: Lady Gaga Sings 'Sound of Music' Medley

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Lady Gaga performs during the "Sound of Music" tribute onstage during the 87th Annual Academy Awards at Dolby Theatre on February 22, 2015 in Hollywood, California. 

The hills were alive once again, and this time, Lady Gaga was there.

As a celebration of the 50th anniversary of the release of the film The Sound of Music, the Oscars put together a montage of the iconic film followed by a showstopping Gaga performance of numbers from the musical. 

Oscars 2015: All Our Coverage

Donning a white dress and following an intro from Scarlett Johansson, Lady Gaga sang a medley of "The Sound of Music," "Do Re Mi," "Edelweiss," and "Climb Ev'ry Mountain," and her powerful pipes were met with a standing ovation from the audience.

One very special guest also approved: Following the numbers, a grinning Julie Andrews then joined her onstage, embracing the singer and thanking her for her showstopping performance.