Scarlett Johansson and her boyfriend Colin Jost have ''a great energy between them''.

The 32-year-old actress started dating the 'Saturday Night Live' star earlier this year and was recently spotted in the crowd at Colin's comedy show in Boston.

A source explained: ''Scarlett was very supportive of Colin. She sat fourth row and was laughing hysterically along with the rest of the audience.''

The Hollywood star also joined Colin, 35, after the show and the loved-up couple appeared to be in great spirits, according to an eyewitness.

The insider told Us Weekly: ''They seemed very much like a new couple, holding hands and had a great energy in between them.''

Scarlett - who has a three-year-old daughter named Rose with her ex-husband, French journalist Romain Dauriac - was first linked to Colin in May, after they were spotted together at the 'Saturday Night Live' season finale after-party.

And their burgeoning relationship has seemingly been heating up over recent months, with the duo being frequently seen together on dates around New York City.

Earlier this month, for instance, the pair enjoyed a dinner date at Indian Wells Tavern.

At the time, an eyewitness said: ''They were snacking on wings. They were holding hands as they sat across the table from each other when the server approached them.

''They sat at a bar table close to the window and were smiling and talking to each other.''

Despite this, Scarlett - who was also previously married to fellow Hollywood star Ryan Reynolds - has admitted to being sceptical about monogamy.

The 'Ghost in the Shell' actress explained: ''I think the idea of marriage is very romantic; it's a beautiful idea, and the practice of it can be a very beautiful thing. I don't think it's natural to be a monogamous person.''