The 21-year-old singer performed at the Borderfest concert at the State Farm Arena in Hidalgo, Texas a day after reuniting with on/off boyfriend Justin Bieber.

The Come And Get It singer looked stunning in an all-white ensemble that showed her toned arms, flat mid-riff and plenty of leg.

She’s back: Selena Gomez returned to the stage on Saturday in Hidalgo, Texas after cancelling the final shows of her last tour and entering rehab in January

Working the room: Selena sang and danced in a revealing white outfit

The Texas native had her long dark hair down as she sang and danced on the stage.

Selena and 20-year-old Canadian pop star Justin grabbed breakfast together on Friday at Don Pepe’s in Hidalgo County before hitting up a Starbucks in the afternoon.

Justin on Monday posted two photos of the Wizards Of Waverly Place actress in her revealing gold gown at the Vanity Fair Oscars party.

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She’s got moves: Selena showed her dance moves while performing at Borderfest

Sexy outfit: Selena showed her toned physique in the sexy white outfit

His caption read, ‘Most elegant princess in the world.’

The gushy note came as a bit of a surprise after the couple reportedly had a bad falling out earlier this year.

Before their Texas reunion, they were last seen together in January riding Segways in Justin’s neighbourhood in Calabasas, California.

Flowing skirt: Selena earlier tweeted about her excitement over returning to the stage

Selena posted a photo of herself at Starbucks on Friday with a message to her fans.

She wrote: ‘Hidalgo, I’ve missed this  ill see you soooon (sic).’

The Instagram shot showed her wearing sunglasses and a leather jacket, with her hair loose around her shoulders.

Selena posted another photo on Saturday showing her giving two young fans a big hug.

Feeling it: Selena closed her eyes while performing

‘Reunited and it feels sooo good  TX always makes me proud #littles #realmexicanfood #home,’ Selena wrote to her more than 18 million followers on Twitter.

The Spring Breakers star in January voluntarily checked herself into a recovery centre in Arizona as she dealt with emotional issues.

The Australian/Asia leg of her Stars Dance tour was cancelled in December before she entered rehab.

Her representative told MailOnline: ‘Selena voluntarily spent time at Meadows but NOT for substance abuse.’

Back home: Selena tweeted on Friday that she missed performing