Evan Peters and Emma Roberts are engaged again.

Evan Peters and Emma Roberts

Evan Peters and Emma Roberts

The 29-year-old actor split from his 25-year-old on/off love for the second time in May this year, but they recently got back together and are planning to wed.

A source told Us Weekly: "Emma and Evan are engaged again. She's been wearing her ring on set. Everyone on set knows

The pair - who star together in 'American Horror Story' - have been amicable since their split in May, and were seen acting "like a couple" back in August when they attended the FYF Fest music festival in Los Angeles.

An eye witness said: "They definitely seemed like a couple. They were hugging and she was playfully messing around with him. They definitely showed signs of being together."

The duo first met on the set of 'Adult World', and started dating soon after in 2012.

They got engaged over Christmas in 2013 but called off their marriage plans in June 2015.

Evan and Emma later reconciled in August of the same year before splitting in May.

Speaking about how she met Evan, Emma previously said: "Everyone thought we dated on the movie ['Adult World'] and we didn't, not for a long time. I, actually, on the set, was like, 'Oh yeah, we're totally gonna date.' And I would try to, like, flirt with him, which ended up looking like I had something in my eye because I'd be like, 'Hey, what's up?' And he literally didn't speak to me the entire movie. He thought I was so weird."