The actress never set out to be an A-lister and when she found herself on the red carpet next to Tom Cruise, she suddenly realised she wasn't cut out for that level of celebrity.

In a new interview with U.S. talk show host Chelsea Handler, now available to stream on Netflix, the Bridget Jones's Baby star admits she had a "difficult transition" to fame.

"I like the job, I really like the job," she explains. "I like to go to a set. I like the camaraderie. Fame is weird to me. It's not natural. You know, it's not natural, and you don't have an opportunity to meet people in a genuine way."

And Renee confesses she often feels like an "imposter" on a film set, adding, "I'm not trained, so I feel like every job I've got by accident because I've tricked them, and they just haven't found out yet."

The roller-coaster started with that 1996 Cruise film, which featured the famous line, "You had me at hello". Renee reveals the premiere was "emotional" for her and her family.

"I didn't know what to expect," she told Chelsea. "I had no idea what was about to happen. My parents were there. They're your most important people, so this big film ends and it's really well-received, then you're swept away and there's no more contact with your mum and dad.

"They're left there, and you're moving around, shaking hands and taking pictures, signing things and saying hello. You have responsibilities that don't include them. It's like a distancing that they feel like they're losing you in some way.

"They were so vulnerable. It broke my heart. It made it clear to me early on that this was going to be a difficult transition for both of us, really. (My mum) was just teary because she thought she was going to spend this most special night ever with me, and we didn't have the opportunity to walk around together and share it. I've been hyper-aware of it ever since."