The 32-year-old actress was seen vrying with the Saturday Night Live star in May, before being spotted holding hands with her lawyer Kevin Yorn.
But Scarlett has now reportedly turned her attention back towards Colin, as the twosome were out together in New York recently.
A source told the New York Post newspaper’s Page Six column: “They seemed very into each other.”
And a witness reportedly said they were “looking cosy on a love seat”.
Rumours of their burgeoning romance first came to light some months back after they were seen vrying at the after-party for the Saturday Night Live season finale.
At the time, an insider said the Lucy actress and Colin, 35, were making no attempt to hide their affections.
A source shared: “They would make out a bit, then go back to talking. Scarlett and Colin were flirting and canoodling in full view of everyone at the after-party.”
Scarlett had filed for divorce from her second husband Romain Dauriac earlier this year.