United Kingdom, April 10 -- Justin Bieber has adopted a hands-on approach to his Coachella set.

The 32-year-old pop star has been busily preparing to take to the stage at the world-famous festival in California, and Justin has made sure to leave no stone unturned.

A source told Us Weekly: "He's been involved in everything all along, from negotiating his own paycheck to working on the show's creative direction. He even helped design the merch that'll be sold on the grounds - T-shirts, hoodies, hats, etc."

Justin is reportedly set to become the highest-paid act in the festival's nearly three-decade history. And the insider said that the chart-topping singer is determined to prove himself on his own terms.

The source said: "Justin doesn'...