Selena Gomez Sobs In 'The Heart Wants What It Wants' Single, Video About Justin Bieber

Selena Gomez has just dropped a heart-wrenching music video for her new single "The Heart Wants What It Wants."

The song is already No.1 on iTunes within three hours of its Thursday release.

The modern midtempo is a collaboration with the Rock Mafia songwriting/production team, and it's a stunning showcase for the songstress.

The emotional cut will feature on the starlet's "Greatest Hits" For You album, which will be released November 24.

"I have been waiting to share this with all of you," Selena tweeted and Instagrammed, also including a link to the video for her debut song.

At the start of the clip, which is set in a stylish dressing room, the pop princess delivers a spoken introduction that clearly addresses her tumultuous on-off relationship with Justin Bieber.

"When I was on stage and I was thinking of... I felt like I know him. I know his heart and I know what he wouldn't do to hurt me," Selena says, in between tears.

She goes on, "But I didn't realise that feeling so confident and so great about myself and then it just be completely shattered by one thing. By something so stupid."

"But then you make me feel crazy, you make me feel like it's my fault. I was in pain."

As the action moves on in the visual, with Gomez wearing an all-black ensemble of slayer heels, A-line dancer-shorts and a sheer shirt, completed by Bardot-esque hair, she joins a crowd of pals and her leading man.

Devastating lyrics continue throughout the song. In particular, the bridge into the stuttered chorus, which Selena sings each time with edits of her facing the camera dead-on.

"The bed's getting cold and you're not here / The future that we hold is so unclear / But I'm not alive until you call."

"And I'll bet the odds against it all / Save your advice 'cause I won't hear/ You might me right but I don't care," she continues.

"There's a million reasons why I should give you up / But the heart wants what it wants."

Selena Gomez

A raunchy part of the video comes when Selena and her love-interest engage in sexy PDA during the song's soaring bridge.

The "couple" are seen surrounded by others in a party setting, while the starlet appears to watch pensively as her guy drinks a beer.

The scene shifts to the loved-up pair getting intimate on the counter of an empty bar, then making out in a car while bittersweet lyrics play.

"This is a modern fairytale / No happy endings / No wind in our sails," Selena sings, as her man grips her hair and kisses her.

Then, "But I can't imagine a life without / Breathless moments / Breaking me down."

Selena Gomez

"The Heart Wants What It Wants" video fades with a title repeat and Selena walking away from her lover through an industrial corridor -- evidently reluctantly.

Online chatter reveals fans are raving about the single, their girl's vocal performance and the brutal honesty of the video's opening moments.

The starlet's premiere comes after her Instagram visual tease on Wednesday, and Ryan Seacrest revealing via Twitter that his radio interview with Gomez will air today.

No doubt many fans will be tuning in to hear what Selena says about her new release and promotion plans for her For You album. You can hear the "On Air With Ryan" interview at this link at 7 a.m PT/ 10 a.m ET.

Earlier this week, Gomez teased her new music.

"As I have a last listen, I thought a lot about my year. I thought a lot about my voice," read her caption to a black and white selfie taken in a recording studio and posted Monday.

She added, "And after a year of holding on. I think it's time to start sharing. #November," referencing her relaunch month.

Selena Gomez
(Photo: Selena Gomez announce she is ready to share her "Greatest Hits" album with the world.)

The 15-song set of For You runs through the 22-year-old's past and present, including her Selena & The Scene days, the hits "Come & Get It" and "Slow Down" from the 2013 Stars Dance LP and two new songs -- "THWWIW" and "Do It."

Without question, Selena and Justin's latest, recent breakup, adds a real poignancy to her "The Heart Wants What It Wants" release. Life imitating art indeed.

Pre-orders for For You are available, as is the new single here.

[Images via Instagram]