AceShowbiz - Selena Gomez designed a special bathing suit that hides her kidney transplant scar to promote her best friend's new swimwear line.

The 25-year-old posed in the item as part of the unveiling of her former assistant-turned-close pal Theresa Mingus' debut fashion venture, which launches on Thursday, May 02, and was developed to flatter various body types.

As part of the collection, Mingus called on the actress and singer to craft three limited edition styles for the Selena x Krahs Swim capsule. Among the pieces are a plunging bikini top, a one piece and high-waisted bottoms.

The high-rise bottoms were part of an effort to create a look that would hide the scars from the "Come & Get It" hitmaker's 2017 kidney transplant surgery.

"I did have a really good time designing," Gomez tells People magazine. "It was fun. The design I did, one of them, it was the high-waisted one with the belt. I've had a kidney transplant and I like bathing suits that kind of cover where that's been - and make me feel comfortable."

"Every woman wants to feel sexy. Every woman wants to feel confident and beautiful," Mingus adds in a video promo featuring Gomez. "I definitely want to have a variety of different pieces, so everyone can wear them."

On Monday, the "Same Old Love" hitmaker took to Instagram to share touching words of support for Mingus, ahead of the release.

"I met Theresa 5 years ago. We worked together and became best friends," she wrote alongside a photo of the pair. "She has taught me how to see life in a fun, carefree and uplifting way. She has shown me how to be a strong and fearless woman. She is beautiful, kind and smart. I saw how capable she was of achieving her dreams."

"I wanted nothing more than to see her pursue them and soar. And here you are making it happen T. I love you and I am so proud of you."