Selena Gomez Rehab, Lupus Relapse? Justin Bieber Posts Instagram, Twitter Video Of Sexy Couple Dance

Justin Bieber posted a video of himself dancing romantically with Selena Gomez in a dance studio in Texas where they appear to be back together, leaving many fans wondering if the "Slow Down" singer is experiencing a relationship relapse after dealing with her rumored rehab and lupus issues.

Selena Gomez and Niall Horan jealousy rumors are flaring on Twitter and Instagram after it was reported that the One Direction singer is dating Barbara Palvin.

The "Slow Down" singer laughed after seeing a picture of herself on Justin Bieber's Twitter and Instagram with a caption describing her as the "most elegant princess in the world," TMZ.com reports.

The "Slow Down" singer also said it was stupid and childish, the website also reports.

Selena Gomez was spotted "drinking and stumbling" at a Vanity Fair Oscar Party last weekend, leaving many wondering if rumors about her lupus disease and rehabilitation are a cover-up for her potential alcoholism.

"Selena was drinking constantly throughout the entire party when I saw her," an eyewitness told Radar Online.

Justin Bieber posted Twitter and Instagram photos of his ex-girlfriend with a caption saying she is the "most elegant princess in the world."

Last week, Selena Gomez thanked Demi Lovato for helping her during her time in rehab, which was rumored to be contributed by her lupus disease.

"I want to thank Demi. Just the fact that we're here at 21 years old, and we've always talked about using our voice to help this generation.," Selena Gomez said during speech at a UNICED awards dinner.

"Sometimes I feel like we're the only ones holding the fort and I'm so thankful for you [inspiring] me every day."

Selena Gomez's friends are concerned about her health and the "Slow Down" singer may need to check in for more rehab, PerezHilton.com reports, leaving many fans wondering if her lupus disease may be getting worse.

"It is not humanly possible to recover from your rock bottom that quickly. We're all concerned for her well-being," a source told the website.

"She's still very fragile and not coping with her problems at all. She's jabbering to herself, and everyone is worried she's about to pull a Britney [Spears] - she's a very troubled young girl, and if she doesn't get it together, the psych ward could be next."