This is What's Trending Today...

Singer Selena Gomez made her name acting in children's television shows. She was also singer Justin Bieber's girlfriend for a while.

But recently she is better known for her music.

In fact, she has one of the top songs of the summer.

Selena Gomez accept the award favorite female artist pop/rock at the American Music Awards at the Microsoft Theater on Sunday, Nov. 20, 2016, in Los Angeles. (Photo by Matt Sayles/Invision/AP)

Songwriter and DJ Kygo's song "It Ain't Me" features Gomez. It is ranked 20th on Billboard.com's current summer music chart.

You might think Gomez would have been singing at concerts around the world or appearing on television shows to talk about her music.

But instead, she was preparing for a serious medical procedure.

Gomez is the world's most popular person on Instagram. She has over 125 million followers.

On Thursday, she used Instagram to explain why she was "laying low" this summer.

She posted a photo of herself in a hospital bed with her friend Francia Raisa. She said she needed a kidney transplant because of the disease lupus.

Gomez received a kidney from her friend. Humans are able to live without one of their two kidneys.

Lupus is a condition that affects a person's immune system. An immune system that works well fights diseases and viruses.

According to the Mayo Clinic's website, lupus causes the body's immune system to attack its own organs and tissue. Organs affected by lupus include the kidneys, brain, heart and lungs.

Gomez thanked her doctors and her friend. She wrote that she "looks forward" to being able to tell the story about her experience sometime soon.

She called Raisa her sister and said donating a kidney was the "ultimate gift and sacrifice."

Raisa is an actress and model. She appeared in a well-known television show called "The Secret Life of the American Teenager."

Many people reacted to Gomez's Instagram post. They offered support for Gomez and they told Raisa what a great thing she did by donating her kidney.

One user, Ingrid Talledo, wrote: "@franciaraisa, you deserve the sky. Thank you so much for everything that you did. You deserve all the love of the world."

Gomez has been dealing with lupus for several years. In 2014, she had chemotherapy to treat the disease.

And that's What's Trending Today.

Dan Friedell wrote this story for Learning English based on reports by the People magazine and the Today Show. tktk was the editor.

What do you think about Selena Gomez's kidney transplant? We want to know. Write to us in the Comments Section or on 51VOA.COM.

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Words in This Story

chart – n. a list that shows which music recordings have sold the most during a recent period of time

lay low – v. to not go out in public very often, stay out of the spotlight

transplant – n. a medical operation in which an organ or other part is removed from the body of one person and put into the body of another person

immune system– n. the system that protects your body from diseases and infections

chemotherapy– n. the use of chemicals to treat a disease, like cancer