"The Mortal Instruments: City of Bones" stars Lily Collins and Jamie Bower Campbell have not been shy about the relationship they formed since meeting on the film set back in 2012. In her latest photo shoot with Glamour Magazine UK, singer Phil Collins' daughter spills about dating her co-star and her life in the spotlight.

She told the magazine how it was working on the set with her boyfriend and Irish actor, Robert Sheehan. She said, "For a while it was just the two of us. Then came Robert. It's funny because they're so different.  Robert is so enthusiastic and so Irish and Jamie is so British, edgy, witty and charming. The three of us were joking all the time."

Collins went on to spill details from on the set, including what it is like to kiss on-screen, she said, "In terms of kissing, I promise you that it is super awkward and super unsexy because everyone's staring."

[For photos of Lily Collins' Glamour Magazine UK shoot click HERE]

The actress also revealed that she understands why people tend to fall in love while filming a movie, "People are cast because they have chemistry. You're spending 24-hour days together and it's intense... plus you really get to know the best and worst sides of people - the rawest sides of people.

"You're perfect for the role because you have that connection with each other and sometimes that translates into more."

Wise beyond her years, Collins said that she knew that by getting into the acting business your private life would become very public, she told Glamour, "I entered into this business knowing your private life can't always remain private.

"I don't feel the need to profess anything publicly or confirm something that in a normal situation you wouldn't have to speak out about. If I'm out and I'm photographed with someone, then that is what it is. We took that chance and... whatever. It is what it is"

The actress also revealed that she isn't a fan of getting a job just because she has a famous father, "Seeing fame from such close quarters did affect me. It didn't put me off doing something that I wanted to do, but it made me determined to finish school first.

"I never wanted to get a job because someone had made a phone call for me. Nobody has ever made a phone call for me. Weirdly, I enjoyed being knocked back at the beginning. Being told no so many times made being told yes that bit better."

For more on Lily Collins and details about her love life pick up her Glamour Magazine UK September issue when it goes on sale August 8th.