Jayden Shops at Erewhon While Britney in Rehab

' youngest son Jayden James Federline grabbed a smoothie and some groceries at Erewhon in Calabasas, on Wednesday as she receives treatment at rehab following her March 4 DUI arrest.

The 19-year-old high school grad is helping house sit his 44-year-old famous mother's $9.8 million, 21-acre Thousand Oaks mansion.

Same goes for Spears' 20-year-old son Sean Preston Federline, who now goes by 'Sean P Spears' on his private Instagram account.

6ft3in Jayden is said to be pursuing a career in music production, and the winner publicly showcased his piano skills in 2024.

'Sending this piano to my son this year!' Spears - who boasts 42.3 million Instagram followers - wrote on January 8.

'I will never perform in the US again because of extremely sensitive reasons but I hope to be sitting on a stool with a red rose in my hair, in a bun, performing with my son in the UK and Australia very soon. He's a huge star and I'm so humbled to be in his presence! Godspeed, little man!'

On Monday, a source told the National Enquirer of the semi-retired pop star's intervention: 'The boys sat her down and were brutally honest. They told her, "We need you. We want you healthy." And that hit her harder than anything. She realizes she hit rock bottom, and she knows strategically this will look good in front of the judge.'

Spears is due back in Ventura County Court on May 4 after reportedly being caught driving erratically at a high rate of speed while 'on a cocktail of booze and Adderall.'

At the time, the Hold Me Closer hitmaker's reps called her arrest 'an unfortunate incident' that was 'completely inexcusable.'

Same goes for Spears' 20-year-old son Sean Preston Federline, who now goes by 'Sean P Spears' on his private Instagram account (pictured March 29)