When she signed on to Only Murders In The Building, Selena Gomez became the third member Steve Martin and Martin Short didn't even know they needed.
Selena, who started off as a Disney Channel star, has become best buds with the comedy duo, can hold her own in their bizarrely funny interviews, and even made a surprise appearance when they co-hosted Saturday Night Live.
That's why Steve Martin simply can't bring himself to watch Selena's new documentary My Mind And Me.
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The Apple TV doc looks into the singer's mental and physical health, and how a life of fame starting from a young age has impacted it.
As well as being diagnosed with lupus in 2015, Selena has also suffered from psychosis and a bipolar disorder diagnosis.
An official synopsis of the documentary reads: "After years in the limelight, Selena Gomez achieves unimaginable stardom. But just as she reaches a new peak, an unexpected turn pulls her into darkness. An intimate study which spans her six-year journey into a new light."
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At one point in the heart-wrenching film, Selena recalls a time when she felt the world 'would be better' if she wasn't there.
She told cameras: "I'm going to be very open with everybody about this: I've been to four treatment centres.
"I think when I started hitting my early twenties is when it started to get really dark, when I started to feel like I was not in control of what I was feeling, whether that was really great or really bad."
Since then, Selena began seeing a psychiatrist who has taken her off all but two of her medications.
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It was after this point that she signed on for Disney+'s Only Murders In The Building alongside Steve Martin and Martin Short.
Two seasons later, the three are incredibly close friends, but Martin recently confessed that he hasn't been able to watch his co-star's documentary just yet.
Speaking to The View, he revealed: "I kind of resist because I feel parental toward her or friendly or something and I know it's sad.
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"Somehow I just don’t want to see her sad."
Later on in the interview, he added that he does plan to watch the documentary at some point, but he just needs to build up the courage first.
If you're experiencing distressing thoughts and feelings, the Campaign Against Living Miserably (CALM) is there to support you. They're open from 5pm–midnight, 365 days a year. Their national number is 0800 58 58 58 and they also have a webchat service if you're not comfortable talking on the phone
Topics: Celebrity, Film and TV