And while she and Foster have been spotted around the Big Apple during their downtime off set, the former star of actress Robin Wright, but the two broke off their engagement last year after dating for over three years.
Prepon was last romantically linked to Christopher Masterson, whom she split with in 2007.
Tuesday when all eyes turned to her flashy ring finger.
The 36-year-old proudly posed with her diamond ring as she and fiancé Ben Foster made their red carpet debut as a couple.
A source later confirmed the actors are indeed planning to wed.
Prepon modeled a Nha Khanh dress, LK Bennett heels and carried an Inge Christopher clutch at the event.
The actors announced their engagement after dating for a few months, and about a year after Foster ended his previous engagement to actress Robin Wright. If you didn't even know that Prepon and Foster were dating, you're not alone.
The actors have been keeping their relationship very low-key, and have only been sighted together a few times since they reportedly began dating this summer. Foster and Wright first became engaged in 2014 after dating for two years, but Wright broke it off the same year, reportedly due to her growing work schedule and a difference in maturity levels.
That will probably get me yet another letter from someone’s lawyer …He appeared on the television series That '70s Show, which featured Topher Grace.He began dating actress Laura Prepon in 2001, but they eventually split in 2008.The British magazine Grazia reported last fall that Cruise, 51, picked up Prepon, 34, in a vintage car and had a bottle of 1979 merlot waiting on the table when they arrived at the Manor Hotel for dinner. That’s pretty much standard whenever I pick up one of my buddies to go bowling. It’s clear Tom is smitten and after the date he was on cloud nine,” the magazine reported.“They had their second date at the restaurant, too, meeting for Sunday brunch, and then she accompanied him a few days later to a dinner party at John (Travolta)’s home.” Nevertheless, an “insider” (Cruise’s publicist) told Us Weekly, “They see each other at some functions, but they are not dating.” Reps for Cruise and Prepon continued to have the (checks thesaurus again) effrontery, the IMPUDENCE, to deny the romance to the Post on Wednesday.Actor who had an acclaimed role as Francis on the hit sitcom Malcolm in the Middle.He had a minor role as Scotty O'Neal in the popular film My Best Friend's Wedding (1997).Prepon dated Christopher Masterson, the brother of her "That '70s Show" costar Danny Masterson, for seven years before splitting from him in 2007.Things have heated up very quickly for Laura Prepon and Ben Foster.Prepon dated “Malcolm in the Middle” actor and fellow Scientologist Chris Masterson for years before a reported breakup in 2012.When you think about it, the world of Hollywood is really quite small. Nick Jonas Disney sweethearts Selena and Miley both dated Nick Jonas.The "Oblivion" actor has not been linked to a woman since his divorce from Holmes in June 2012, after the couple's six years together."Tom still sees (Suri) and speaks to her on the phone," a source told the magazine, of Cruise and Holmes' 7-year-old daughter.Cruise and the “Orange is the New Black” actress are being extremely careful to keep their relationship a secret, the Post said.