At the stroke of midnight, King Felipe VI officially became Spain's new monarch following a ceremony at the Royal Palace in Madrid which approved and enactmented a law bringing into effect Juan Carlos's abdication.
On Wednesday night, a tearful King Juan Carlos signed his abdication of the Spanish throne after a four-decade reign, leaving the crown to his 46-year-old son, Felipe VI.
An emotional King Juan Carlos sealed his abdication and then embraced his son who will be sworn in on Thursday morning in a low-key ceremony at the Congress.
There was a round of applause for the abdicating king as he stood flanked by the newly crowned King Felipe and Queen Letizia, and his wife Queen Sofia.
For tonight's abdication ceremony, Queen Letizia repeated her monochromatic dress from Felipe Valera which she wore in April this year to a lunch for the Cervantes Award. The skirt features a delicate black beaded embroidery on both sides.
She carried a black satin clutch and wore her sand patent pumps by Spanish shoe maker Magrit.
Her jewellery was kept simple, wearing only her 'wedding' earrings which were a gift from her in-laws, the King and Queen.
SHOP QUEEN LETIZIA'S STYLE FOR LESS ...