Sarah Hyland and Wells Adams are acting "flirty".
The pair have been friends for a while but their relationship could soon move to the next level as they have been "hanging out" more.
A source told People magazine: "They've been friends for a while and now they've been hanging out and spending more time together. They're flirty."
Sarah - who split from her longtime boyfriend Dominic Sherwood earlier this year - also posted a photograph of the pair standing in front of a bloodied background wearing matching 'Stranger Things' Halloween costumes.
She captioned it: "#strangerthings have happened #happyhalloween (sic)"
Sarah and her ex Dominic had been dating for two years before they called time on their romance.
A source said at the time of the break up: "Hyland and Sherwood will remain friends, but notes that their relationship has simply ran its course."
And Sarah later confirmed the split when she lamented about being single.
She wrote on Twitter earlier this month: "The problem with being single isn't the fact that you're alone. It's that you can't puppy dog eye a guy into getting you Starbucks in bed."
And when a fan suggested she could try dating apps, she said: "Yuck gross. To each their own but dating apps aren't for me. I like the natural progression of a person slowly learning im crazy. (sic)"
Sarah and Dominic's split came as a surprise to fans as she had recently penned a sweet message to her other half to mark his birthday.
She gushed at the time: "The best thing to hold onto in life is each other ... Happy Birthday @domsherwood. Thank you for inspiring me on a daily basis to be a better person. To not take things too seriously. And to remember the little things. You're my rock. (sic)"
Tagged in Sarah Hyland