Something to tell us? Laura Prepon flashes diamond ring as she makes red carpet debut with beau Ben Foster 

Laura Prepon and Ben Foster made their red carpet debut as a couple on Tuesday.

The duo, who have yet to confirm their relationship, were all smiles as they attended the premiere of Prepon's new thriller The Girl On The Train in New York.

And it appears things are moving super fast as the 36-year-old Orange Is The New Black star flashed a stunning diamond ring on her wedding finger.

Scroll down for video 

It's official! Laura Prepon made her red carpet debut with boyfriend Ben Foster on Tuesday and also sparked rumours she's set to marry the Alpha Dog star as she flashed what appeared to be an engagement ring

It's official! Laura Prepon made her red carpet debut with boyfriend Ben Foster on Tuesday and also sparked rumours she's set to marry the Alpha Dog star as she flashed what appeared to be an engagement ring

Bling: It certainly seems like their relationship is moving fast

Bling: It certainly seems like their relationship is moving fast

Laura looked stunning in a lace teal pencil dress, black heels and a matching clutch.

She showed off the significant piece of jewelry - a gold band with large solitaire diamond - as she linked arms with the Warcraft star. 

Rumours that the couple were dating first emerged earlier this summer when they were pictured out in New York together.

Us Weekly reported in July that the twosome were spotted making out at French bistro Lucien. 

Hot new couple: The duo were first rumoured to be dating after being spotted on PDA-filled dates in July

Hot new couple: The duo were first rumoured to be dating after being spotted on PDA-filled dates in July

Ben, 35, was most recently engaged to House Of Cards star Robin Wright, 50.

The couple, who had dated for more than three years, quietly ended their engagement for a second time last year.  

Ben and Robin first broke up in November 2014 but got back together shortly after.  

Meanwhile, Laura hasn't been reported to have been in a serious relationship since her 2007 split from actor Christopher Masterson, the brother of her That 70's Show co-star Danny Masterson.

Raven haired beauty: The 36-year-old actress looked gorgeous in a sheer teal pencil dress and black heels
Raven haired beauty: The 36-year-old actress looked gorgeous in a sheer teal pencil dress and black heels

Raven haired beauty: The 36-year-old actress looked gorgeous in a sheer teal pencil dress and black heels 

Romance blossoming: The actors are pictured out together in New York on June 21

Romance blossoming: The actors are pictured out together in New York on June 21

Interestingly, Ben and Laura are both pals of Danny's and it's rumoured that the mutual friendship is how the couple met. 

In 2014 Laura lamented her lack of luck in the romance department.

'When I'm working, it's next to impossible,' she told Cosmopolitan in 2014 as she confirmed her single status. 

'I like to think I'll just be walking down the street one day and stop and meet someone, like, "Oh, my God, you're awesome," and then we start dating. But, no.'

'Guys occupy a lot of attention space in your mind,' she added. 'When I'm working, living in a new place, it's kind of cool I don't have to deal with that.'

Didn't work out: Foster, 36, split from fiancee Robin Wright, 50, last year 

Didn't work out: Foster, 36, split from fiancee Robin Wright, 50, last year 

The comments below have not been moderated.

The views expressed in the contents above are those of our users and do not necessarily reflect the views of MailOnline.

By posting your comment you agree to our house rules.

Who is this week's top commenter? Find out now