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The pop star’s boyfriend Mac Miller today posted a candid photograph of the couple on Instagram to express his love for her.

He posted: “Happy Birthday to this adorable pure soul who has reminded me what being happy feels like.

“Thank you for loving me so good. I think it's supposed to be 'so well' but I don't care. I love you and can't wait for all of the adventures.”

Ariana's mother Joan Grande also joined the chorus of thousands of online well-wishers, tweeting: “Happy Birthday to my fabulous daughter @ArianaGrande… so so so proud to be your mama!! I love you!!”

The star's birthday comes just over a month after a suicide bombing killed 22 innocent fans at her concert at Manchester Arena on May 22.

In a show of defiance against terrorism, Ariana later returned to Manchester for the One Love Concert benefit concert in aid of the victims of the attack.