Prince William and Kate Middleton's relationship is as strong behind closed doors as it appears in public.

After 10 years as Princess Diana's butler, Paul Burrell offered his insight of the couple.

Burrell rejected rumors about Prince William having a wild temper.

He likes the couple's modest love gestures and thinks they're doing well.

Burrell also shared how Kate and William are different from Charles and Diana's troubled marriage.

In later years, Diana turned her cheek against Prince Charles and looked the other way out of the car.

Burrell thinks Kate and William are trying to portray a very positive image, which is good for the royal family.

The insider also stated that Kate and William are a strong couple.

Burrell's insight provides an interesting perspective on the royal couple.