Britney Spears appeared unbothered in her first sighting since finishing rehab.

The pop star was snapped riding in the passenger seat of a black Mercedes Benz G-Wagon with her feet up on the dashboard Thursday, in a pics obtained by Page Six.

She wore sunglasses and had her blond hair down, as she was driven around Westlake Village and Calabasas.

A source close to Spears tells Page Six that the singer is “doing really well” after getting out of rehab Wednesday night.

“She’s healthy and happy and feeling very positive and excited to start afresh,” the source said. “Rehab was a great opportunity for her to ground herself.”

“She’s looking forward to a bright future.”

A second source tells Page Six that Spears is now “continuing counseling remotely.”

The “Toxic” singer was officially charged with driving under the influence Thursday, after her March 4 DUI arrest.

Prosecutors in Ventura County hit Spears with a misdemeanor charge for driving under the influence of drugs and alcohol. She’ll be arraigned in court on May 4.

The charge came after she checked herself into rehab on April 12 for substance abuse.

“This was her own choice,” a source told us at the time. “This isn’t about one substance in particular, it has a dual purpose….this is about Britney putting her mental health first and taking some time for herself to focus on the things that are important to her.”

“She’s dedicated to working on her health,” the source continued. “This is something she really wants to do for herself. This was her own decision.”

Spears was taken into custody last month after authorities saw her swerving in and out of lanes. They also allegedly discovered an unknown substance inside her car during her arrest and she is believed to have been on a cocktail of alcohol and drugs.

Since her arrest, the singer has been spending time with friends and family, including her two sons — Sean Preston, 20 and Jayden James, 19.

Last month she shared pictures of her with her kids spending time together on a yacht.

This story is developing…