United Kingdom, Oct. 25 -- Megan Fox and Machine Gun Kelly have been acting "like a couple," but they "haven't put a label" on their relationship.

The pair were engaged but called it off long before the arrival of their baby daughter Saga Blade in March.

However, they have reportedly grown close again due to spending "pretty much every night" together with their little girl.

An insider told PEOPLE: "They're together often, but he's going on tour soon.

"He spends pretty much every night at her house with the baby, and they act like a couple, but they haven't put a label on it or made anything official.

"Megan's very happy with how he's stepped up for both her and the baby.

While they still have separate homes, they spend a lot of tim...