Lady Gaga & Stevie Wonder Sang 'Happy Birthday' for Elton John's 70th

Lady Gaga and Stevie Wonder united at Elton John's birthday party to sing Wonder's 1981 hit "Happy Birthday." The event raised money for both the Hammer Museum and the Elton John AIDS Foundation.

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Gaga returned to her natural hair color, brunette, in a classic updo for the event, and wore a gorgeous Alberta Ferretti gown. In addition to dueting with Wonder, she found time to sing piano renditions of "Bad Romance" and "Born This Way."

Take a look at Gaga and Wonder, as well as some classic Fame Monster piano-ballad Mother Monster, below.

When you're #close but the #vegetation gets in the way. @ladygaga cejebrated @eltonjohn #ejf70 #sorryimnotsorry #revenge #badromance

A post shared by Graham Steele (aka SexierBTCH) (@thegrahamsteele) on Mar 26, 2017 at 1:10am PDT

Lady Gaga and Stevie wonder singing happy birthday to Elton John.#ladygaga #steviewonder #eltonjohn #losangeles #birthday

A post shared by Billy h (@billy_n_la) on Mar 25, 2017 at 11:01pm PDT