Idina Menzel on Oscar Excitement & How Her Son Sings Frozen's 'Let It Go' in the Bathtub

Tony winner Idina Menzel is gearing up to sing the phenomenal Frozen anthem "Let It Go" live on the Oscars on March 2. Watch as the If/Then star talks about why the song has millions of obsessed fans, including at a massive sing-along event on Good Morning America on February 26. (Watch that below, too!) Menzel even laughs that her four-year-old son, Walker Diggs, likes to belt out the unforgettable number in the bathtub. (We need a YouTube video of that stat!) As for her excitement and nerves about performing on the Academy Awards telecast, Menzel said, "This is a dream come true. I am just having fun with it." Catch the interview and the sing-along below.