United Kingdom, July 25 -- Zac Brown is engaged to marry jewellery designer Kendra Scott after a whirlwind romance.

The Zac Brown Band star, 46, went public with his new relationship in May when the couple walked the red carpet at the American Music Awards in Las Vegas and reports suggested they had been dating for several months - and now they are planning a wedding after the musician presented Kendra, 51, with a pink diamond ring.

The happy couple told PEOPLE: "We are so happy and grateful that we found each other."

A source added to the publication: "They were set up by a mutual friend, and are totally in love. They are head over heels and have become inseparable."

The wedding will mark Zac's third trip down the aisle. He was previ...