The Maroon 5 singer and model, who got engaged last summer after dating for a year, tied the knot at Flora Farms in Los Cabos, Mexico, in front of approximately 275 of their friends and family on Saturday night.
While the bride wore a custom-made Marchesa dress, the guests – which included Robert Downey Jr., model Coco Rocha and Levine's bandmates James Valentine and Jesse Carmichael – were not held to a specific dress code, according to a source.
Still, their loved ones came dressed for the star-studded affair – and the hot weather – with most of the women donning summer-inspired dresses and many of the men opting for linen suits.
"All the guests were happy and relaxed," says another source. "They were excited to celebrate with the couple on their big day."
The rustic setting – which has a lauded farm-to-table restaurant – has drawn stars like chef Thomas Keller, Ray Romano and George Clooney.
The intimate ceremony capped off a celebration-filled weekend that included a beachside celebration Friday night at the exclusive El Dorado Golf & Beach Club.
Levine, 35, partied with a group of about 50 friends at the Palms Casino Resort in Las Vegas for his bachelor party in March, but the groom recently told PEOPLE he "had enough bachelor parties" in his lifetime and was ready to settle down with Prinsloo, 25.
"I definitely feel like I'm sitting in the chair I'm supposed to be sitting in right now," he said. "It all feels very natural."