Miley Cyrus and Cody Simpson share sweet Instagram video to celebrate her 27th birthday

Miley Cyrus rang in her 27th birthday with her boyfriend, Cody Simpson, firmly by her side.

Cody took to Instagram to share a video of him and Miley, captioning the snap: "Happy birthday baby. Thanks for being you.”

Watch as Miley Cyrus and Cody Simpson celebrate her birthday:

Miley's older sister, Brandi, then took to her Instagram Stories to share a boomerang of Miley wearing a crown and blowing out the candles on her cake, as her 22-year-old boyfriend sat next to her.

Credit: Instagram

In related news, Miley will reportedly have difficulty speaking after undergoing vocal chord surgery.

Per People Magazine, Cyrus was admitted to hospital for tonsillitis in October where her doctors allegedly noticed "a separate issue" with her vocal chords, one that had been undetected for years.

"After learning of the issue, [Cyrus] was told she would need to have surgery before the end of the year, and that the recovery process would include several weeks of silence," the publication reported, before sharing sources which claim she has since been released from hospital, and is doing well.

Another source told E! News: "Miley's recovery will be several weeks without being able to speak. She is texting and writing things for now. She is doing well and looking forward to getting back to making music."

The 26-year-old referenced the surgery in an Instagram Story of her exercising. "Vocal rest not body," she captioned the snap.

Credit: Instagram / Miley Cyrus

Hemsworth cited "irreconcilable differences" in his divorce from Cyrus, which is reportedly to be finalised next month.

Miley has previously denied allegations of infidelity on her end, saying "I am proud to say, I am simply in a different place from where I was when I was younger. I can admit to a lot of things but I refuse to admit that my marriage ended because of cheating."