Laura Prepon and Ben Foster are engaged.

Laura Prepon at The Girl On The Train premiere

Laura Prepon at The Girl On The Train premiere

The 36-year-old actress sported a brand new piece of jewellery on her engagement finger at 'The Girl On The Train' premiere in New York, America, on Tuesday (04.10.16), and has reportedly accepted her 35-year-old beau's marital request.

According to US Weekly, a source close to the pair has confirmed the pair are planning to tie the knot after going public with their romance in July this year.

The source said: "She was holding onto Ben and was all over him.

"They were really close, talking and laughing [ at the premiere]."

The brunette beauty - who has been cast as Cathy in the film adaptation of Paula Hawkins' novel - has previously dated 'House of Cards' star Robin Wright, but called time on their engagement last year after three years of dating.

Meanwhile the 'Orange Is The new Black' star - who is a practicing Scientologist and joined the controversial religion in 1999 - has admitted Scientology has made her more relaxed and have helped her gain control of her emotions.

Speaking previously, she said: "The auditing has stripped away all of this charge, false ideas, decisions and mis-emotions that were affecting me. I recently had one of my biggest cognitions in a New Era Dianetics session.

"I spotted this decision I made a long time ago that was affecting me to this day. It was a huge realisation...When you really cognate that you are a thetan and you have a mind and body, and that the MEST [mind, energy, space, time] universe does not control you - it puts things into perspective. It takes the weight off you and things become very easy.

"Things don't bother me that had before. I remember I was doing a show with an amazing actor, and we were waiting to hear the fate of our show. He turned to me one day and asked, 'How are you always so relaxed? Nothing seems to bother you. I want to know what you are doing...' I take that as such a compliment and testament to the auditing I have done."