Jennifer Love Hewitt is terrified of losing her 100-year-old engagement ring.

The 29-year-old actress - who recently denied she is expecting her first child with fiancé Ross McCall - always pins the ring inside her costumes on the set of hit U.S. TV show 'Ghost Whisperer' because she is so scared of misplacing it.

She said: "I actually have it tucked in here close to my heart. I pin it inside, so it is never far from me when we are working. It is a lot of pressure because it is 100 years old. It is not something you leave lying in the trailer."

"It was his grandmother's ring and it's over 100 years old. It's a lot of pressure! So I always keep it with me - I promised his family."

Recalling how the 32-year-old British actor popped the question, Jennifer added to TV show 'Entertainment Tonight': "It's literally the first time in my life I have ever been speechless. It was very simple. It was very great. It is something that I want to keep for myself if possible."

"But I think the thing that was the best for me is that there were no nerves for either one of us. Ross was the calmest I have ever seen him and my answer was the easiest to give, so I think that is a good thing."