Infanta Cristina, who recently moved to Geneva with her children, arrived at the Quiron Madrid Hospital with her secretaries on Wednesday.
Elegantly dressed in white trousers, a patterned top and a chic beige jacket the mother-of-four was seen entering the hospital where her father spent three hours undergoing hip surgery on Tuesday.
Cristina's older sister Infanta Elena was also seen at the hospital with her son Froilan as were Prince Felipe and his wife Princess Letizia.
Stylish Letizia sported white trousers, a green top and dusky pink heels for the visit, while Spain's first in line to the throne wore a blue suit with a pink tie.
King Juan Carlos, 75, was admitted to the hospital on the outskirts of the Spanish capital for his left hip to be replaced after it became infected.
U.S. surgeon Robert Trousdale of the Mayo Clinic in Minnesota flew to Spain especially to carry out the surgery, alongside Dr. Miguel Cabanela.
The King will have to undergo a second operation within the next two months to implant a new, permanent artificial left hip, as the one inserted on Tuesday was a temporary measure following infection in the tissue surrounding the artificial hip.
According to Dr. Miguel Cabanela, Juan Carlos will be taking antibiotics intravenously for the next six weeks.
Once his second surgery is completed successfully, he will have to use crutches for the same period.