Forget long distance relationships and late night phone calls. I think we can all agree the only way to truly test the strength of a friendship is to play a game of 'Fact or Fiction'.
After all, if your BFF doesn't know your favorite colour, your schoolgirl crush and your guilty pleasure (*cough* Michael Bublé) then are they really a friend?
We think not.
And it appears Blake Lively was keen to put her long-term friendship with American fashion designer, Michael Kors, to the test recently and grill him all about her childhood, natural hair colour and her childhood pets.
You know, just your average question and answer for an internationally renowned fashion designer.
During the quiz, Blake – who over the weekend painted her 'Mrs.R' 'engagement' ring – revealed to Kors she was 16-years-old when she had her first kiss.
'It was on camera. My first kiss was in a movie. I was so terrified,' she admitted.
She later revealed her childhood crush was David Letterman ('He had my Dad's dry sense of humour') and her childhood dog was called 405 ('after the Los Angeles freeway').
However, the best part of Lively's confessions was when she let slip her husband, actor Ryan Reynolds, played Marvin Gaye's 'Let's Get It On' while she was in labour.
'My doctor was laughing so hard that I thought she was going to drop our baby,' she joked.
Somehow, this doesn't surprise us.
I mean, given the way he frequently shuts down fan proposals for sex on Twitter and falls into a fit of giggles every time he is with his BFF Jake Gyllenhaal, we'd expect nothing less from the Deadpool star.
Watch the video below: