EXCLUSIVE: Idina Menzel on Her 'Very Personal' New Album 'idina.': 'I Use the Music to Really Try to Explore'

Prior to her big engagement news on Friday, Idina Menzel opened up to ET about letting go of "Letting Go" with her new album, idina.

"'Let It Go' was on the radio, and was being played by stations I never even imagined would pick up the song," Menzel told ET. "It actually has helped me. It's broadened my audience."

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The Tony Award-winning entertainer had a whirlwind year in 2014 full of highs (Frozen became one of the biggest animated movies of all time) and lows (her divorce from Taye Diggs was finalized), all of which she captured on her fifth studio album.

"I just use the music to really try to explore that, and write down what I was going through," Menzel said.

Menzel is definitely back on an upswing with the announcement that she is engaged to fellow theater star Aaron Lohr!

"As if this week couldn't get any better, I have wonderful news," she tweeted. "My man and I are engaged! We are so happy. It's a beautiful time."

WATCH: From Divorce to 'Frozen': Idina Menzel's Roller Coaster Year

Next up for Menzel is Lifetime's remake of Beaches. Menzel is playing Bette Midler's role in the TV movie, which was a gig she almost didn't take.

"I don't particularly like to choose projects where I have to walk in an icon's footsteps," Menzel explained. "I found though -- after I said no a bunch of times, because I was terrified -- that there's a whole young audience that had never even heard of Beaches."

Menzel's new album, idina., is out now.