The 'Wolves' singer - who has spoken publicly about her mental health issues including anxiety and depression - was reported to have spent two weeks at the Privé-Swiss rehab facility in Connecticut last month.
And after her 23-year-old boyfriend whisked her off on a romantic getaway to Laguna Beach, it has been claimed he's doing his best to support her in her recovery.
A source revealed: ''It was [one of] her first nights out in public since rehab. They were seated away from all the action outside by the pool for privacy. They seemed very sweet together, cozying up and canoodling. He was being very tender and attentive ... a sweet, supportive boyfriend.''
Selena, 25, is said to be a big fan of the hotel, and also spent time there with her ex-boyfriend, The Weeknd.
Another insider told the New York Post newspaper's Page Six column: ''She stays there a lot ... She's on and off with Justin, but they're back on ... for now.''
The couple appear very much back on, spent the weekend staying at the luxurious Montage Hotel for a romantic pre-Valentine's Day getaway.
A source said: ''Justin and Selena had a driver take them down to Laguna Beach on Saturday afternoon.
''They took a walk on the path in front of the resort that overlooks the ocean. It was a cloudy day, [so] they didn't spend too much time outside. Justin was showing Selena around and checking out the beautiful view.''
The 'Bad Liar' hitmaker first checked into rehab at Arizona's Dawn at the Meadows facility in 2014. She also sought treatment at a Tennessee facility in 2016.
Justin and Selena have been dating on-and-off since 2009, but the brunette beauty's mother, Mandy Teefey, recently admitted she is ''not happy'' about them rekindling their relationship late last year.
Mandy said: ''Selena can live her life however she wants as long as she is happy, safe and healthy ...
''She is 25 years old and knows what is at stake with her health. I do not control her the way it has been portrayed. Selena is an adult and can make her own choices.''
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