The Spring Breakers star looked happy and healthy as she soaked up the sun in a white high-waisted bikini surrounded by her gal pals.

She worked her long brunette locks into a sleek ponytail and complemented her beach attire with a pair of oversized gold hoops.

Posting five photos in total, Selena beamed in every shot as she caught up with her nearest and dearest to mark her friend’s future nuptials.

Captioning the shots, the former Disney star wrote: “My best friend is getting married, so we celebrated her! Future Mrs. Lopez”.

6She celebrated the engagement of her best friend Courtney J Barry, leftCredit: Instagram6The Good For You hitmaker, 26, had taken time out of the spotlight to focus on her mental health in recent monthsCredit: Instagram

Last month, Selena returned to music after she appeared on Julia Michaels’ new track Anxiety from her sophomore album, Monologue Part I.

On the track, Selena belts out the lyrics: “But all my friends, they don’t know what it’s like, what it’s like.

“They don’t understand why I can’t sleep through the night.”

Her appearance on the track marks the first time Selena has released music since she sought treatment for her mental health late last year.

6The Spring Breakers star looked happy and healthy as she soaked up the sunCredit: Instagram6Selena donned a white high-waisted bikiniCredit: Instagram

In October, the Monte Carlo actress was whisked off to a mental health facility after suffering an “emotional breakdown” due to crippling anxiety and depression.

Her troubles began to spiral out of control at the end of September, just as ex-boyfriend Justin Bieber, 24, and new wife Hailey Baldwin, 22, were flaunting their love on their European jaunt.

Back at home, Selena was the target of cruel online comments ever since the pair got engaged.

On September 23, four days after the newlyweds’ secret wedding had been confirmed, Selena announced that she was taking a break from social media.

6Her troubles began to spiral out of control, just as ex-boyfriend Justin Biebe and new wife Hailey Baldwin were flaunting their loveCredit: Splash News

After announcing the move to her 144million Instagram followers, she added: “Just remember — negative comments can hurt anybody’s ­feelings. Obvi.”

Days earlier she had opened up to fans in an hour-long Instagram Live video session, revealing: “Depression was my life for five years straight.”Depression and anxiety was the forefront of everything I did in my life, every single thing.”

Aside from her mental health diagnosis, Selena has been battling lupus, a ­painful autoimmune disease, for over four years.

In 2014, she announced: “I was diagnosed with lupus, and I’ve been through chemotherapy.”

Chemo can relieve symptoms of the condition, which causes inflammation of the joints, skin, kidneys and brain. But the illness has blighted her life ever since.