Ariana Grande’s boyfriend Big Sean is allegedly jealous of her relationship with Harry Styles.

The 21-year-old singer formed a close bond with One Direction hunk Harry when she recorded a song called Just a Little Bit of Your Heart that he wrote for her.

And while the pair are nothing more than just pals, her rumoured beau Big Sean is said to be unhappy that they have maintained a friendship.

“Big Sean doesn’t like it that Harry’s been wooing her,” a source told the American edition of OK! Magazine.

“He wants Harry to back off and leave Ariana alone.”

Ariana previously spoke of her admiration of Harry after he played her the track, which features on her second album My Everything, for the first time.

And Ariana added it was the meaning behind the lyrics that made her nervous about recording the song herself.

“ I was more intimidated, because he recorded a demo for me so I could learn the song. I was like, 'I don't know if I wanna touch this song! It is so beautiful, the way he sang it, I don't know if I want to make it my own,'" she told British magazine Heat.

However, Ariana managed to get over her fears and make the song her own.

She also said she is hopeful the track may have helped people see Harry as more than just a boyband singer.

"I was very touched. It's about loving somebody so much that you're willing to share them with somebody else and, like, being OK with that," she said.

"Of course, I had always known him as a vocalist and that's always impressive, but his writing to me is just as good."

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