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The stars came out to support the teens and hospital staff.

\"And then @selenagomez shows up at your prom .... #chocprom2018 #chocprom,\" one post said.

And then @selenagomez shows up at your prom .... #chocprom2018 #chocprom

A post shared by CHOC Children's (@chocchildrens) on Jun 23, 2018 at 8:57pm PDT

Gomez also made sure to have a little fun with some of the guests.

@selenagomez at Our photobooth with CHOC children! She is such a sweetheart for spending her time with these awesome kids and creating such a memorable moment they will never forget at CHOC prom night 2018 @chocchildrens #chocprom2018 #selenagomez #chocchildrens #chocprom

A post shared by Pixta Perfect (@pixtaperfect) on Jun 23, 2018 at 9:46pm PDT

Then Jack Black, sang to the kids and showed them some of his funky dance moves.

... and @jackblack arrives to ensure prom attendees know the latest dance ??moves ... #chocprom2018 #chocprom

A post shared by CHOC Children's (@chocchildrens) on Jun 23, 2018 at 8:59pm PDT

Finally, \"Grey’s Anatomy\" actress Sarah Drew also gave her support.

... and the cast of @greysabc does rounds at the prom. #chocprom2018 #chocprom

A post shared by CHOC Children's (@chocchildrens) on Jun 23, 2018 at 9:01pm PDT

Kara Noskoff, an employee with CHOC, told the LA Times the event helps teens forget about their cancer treatment and recovery for a few hours.

\"They’ve lost hair, gained or lost weight, are covered in surgical scars. So, they can be here, feel safe and comfortable and be with others who know what they’re going through,\" she said.

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