"I'm sorry to my own reflection, I'm sorry for putting you down", she says in a voiceover.
Christina Aguilera has apologised to herself for struggling to "accept the beauty that lies" within her.
Aguilera, 37, was part of the original cast along with fellow coaches Adam Levin, CeeLoo Green and Blake Shelton, and host Carson Daly.More news: Fox Moves to Revive Tim Allen Comedy Series 'Last Man Standing'
Kayne West coproduced "Accelerate" and "Maria", and Aguilera said she "always been a fan" of him. I would find myself on that show desperately trying to express myself through clothing or makeup or hair. "Touring is so frightening to me, because I am a mom first", she said. "I've been placing myself on the again burner".
The most powerful scene in the short film showed Aguilera doing what she does best: singing her heart out.
Meanwhile, a source from the show tells ET, "Christina was an incredibly valuable member of "The Voice" for many seasons and we appreciate all she did for the show". "It's part of why I stayed in the position I was [at "The Voice"]".More news: Rudy Giuliani releases statement "to clarify" his remarks on Trump
The singing superstar is gearing up to release her long-awaited new album, Liberation, in June (18), and she is planning to hit the road to support her first studio project in six years - but the thought of disrupting her two children's lives makes her nervous.
"At one point, she says that a "breaking point" came when she began to let go of the "masks" and perfectionism" that sometimes come with being a performer alongside footage of her staring into the mirror as she takes off a long, pink wig. Promoting her new music will keep Christina busy for months to come, further delaying any plans to Wednesday her fiance of four years, Matt Rutler, Summer's dad, but the pop icon admits she's happy with their family life as is, for now.
The Voice has been a mainstay in American reality television programming since its debut in 2011, where singers are blindly judged by a quartet of famous musicians in the hopes of getting a sweet, sweet cash prize and record deal. Her last was 2012's Lotus.More news: IMI's (LON:IMI) Buy Rating Reaffirmed at Deutsche Bank