A fundraiser from Liverpool got the shock of her life when she came face to face with her hero.
Holly Addison has been raising money for a hospice since the death of her father at the age of 45.
She was nominated for the surprise of her life by her best friend at a restaurant in London.
What Holly didn't realise was that the restaurant was packed with people who were in on the trick.
Including one Pharrell Williams - the man behind the hit record Happy.
Holly's father Gary died in February last year from an extremely aggressive form of brain cancer and she has been raising awareness and money for his condition ever since.
We will be catching up with Holly on our programme at 6pm tonight (26 January 2015).