Kate was ignored at Prince William's birthday party, reveals royal butler.
William and Kate met at St Andrews University in 2001.
They dated for 10 years before marrying in 2011.
They have three children: George, Charlotte, and Louis.
After Queen Elizabeth II's death, they became Prince and Princess of Wales.
They keep their Cambridge titles and inherit the Cornwall titles.
William is now first in line to the throne, with George as second.
The butler says they were just like any other couple in love.
The butler feels privileged to be around the brilliant and fun couple.