The 57-year-old also revealed that it was "really fun" and "nice to be there" with his wife, Amal.
Amal, 40, took to the stage to honour her husband of three years at the event and discussed when they first met.
"I met George when I was 35 and was starting to become quite resigned to the idea that I was going to be a spinster," she joked. "Then we met and started hiding out in my London flat and very soon it felt like no matter what happened I would never want to be with anyone else."
"I couldn't sleep when we were apart, and I was told that I would display a particular grin or head tilt when reading his text messages or the letters he would hide in my bag," she added. "Five years later, none of that has changed. He is the person who has my complete admiration and also the person whose smile makes me melt every time."