The Ghost Whisperer co-stars have been dating since the start of this year (09) following Hewitt's split from fiance Ross McCall.
The couple has been dogged by reports it's heading for a break-up because Kennedy is still in love with his ex, Shannon Funk, Britney Spears' former assistant.
The pair has constantly denied the break-up claims, but Hewitt is annoyed with the continued speculation.
She says, "I’m not going to lie - it’s not annoying, it’s hurtful,. It’s really hurtful that people say that. Because he is like the most awesome person. I really hate that people would make it seem like he’s not really a good guy, and not treating me well. He treats me very well.
"We are just trying to be really happy. It makes it hard to do that when everybody is putting negative energy out there.”