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 enacted a law bringing into effect King Juan Carlos' 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 ceremony at the Congress.
There was a round of applause for the abdicating king as he stood flanked by the newly crowned King Felipe VI 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 her Lambertson Truex 182 Frame Clutch in Black Satin.
On her feet were patent leather pumps in sand by Spanish shoemaker Magrit.
Letizia kept her jewelry simple, wearing only her 'wedding' earrings which were a gift from her in-laws.