The pair was first spotted “making out” at the NBC show’s season finale party in May, but that lip-lock wasn’t their first!
Snitches said they’ve been hot and heavy since the “Avengers” star guest-hosted “SNL” on March 11!
Over the Fourth of July weekend, the lovebirds enjoyed a romantic dinner in the Hamptons — a day after celebrating Colin’s Jost’s 35th birthday.
Scarlett, 32, filed for divorce from husband, Romain Dauriac, on March 7 and is in the midst of a brutal custody battle with him over 2-year-old daughter Rose Dorothy.
“She wants to get the divorce done quickly now because she wants to share a place with Colin,” said a source, “and begin a trial marriage!”