Just a month after her kidney transplant, Selena Gomez seems to be back in the music scene, and this time, with a taste of Electronic Dance Music. On Oct. 20, Gomez posted on Instagram a picture of her holding a bucket of popcorn with EDM producer DJ Marshmello which she captioned "Coming 10.25... WOLVES x @marshmellomusic." The DJ was first known for remixing songs by Jack U and Zedd and later went on to produce his own songs, "Alone" being his first track.

As expected, fans of the singer were ecstatic, because although she was seen attending birthdays and different events weeks after recuperating, this was the first time Gomez stepped out to promote her music since the transplant.

On Sep. 14, via a heartfelt and emotional Instagram post, Gomez disclosed that she underwent a kidney transplant due to her illness. She also mentioned in her post how grateful she is to her family and doctors, specially thanking her best friend, actress Francia Raisa, who was Gomez's kidney donor. Part of her caption read, "There aren't words to describe how I can possibly thank my beautiful friend Francia Raisa. She gave me the ultimate gift and sacrifice by donating her kidney to me. I am incredibly blessed. I love you so much sis."

Gomez was diagnosed with Lupus when she was 20 years old, but the young singer only decided to announce her illness three years after the diagnosis, weeks before the release of her then-album "Revival." Her battle against Lupus also forced her to leave her world tour unfinished last year.

Lupus is a chronic autoimmune disease that attacks tissues and organs. This can cause inflammation, swelling and damages to a person's body — in Gomez's case, her kidney. The Lupus Foundation of America describes Lupus as cruel, unpredictable and is one of the most devastating diseases as Lupus has no cure and remains a mystery to the medical world.