Bingle posted a pic on her Twitter account of the two of them embracing in a recording studio.
She also refers to the singer-actor, who is of Haitian ancestry, as “baby” in a previous tweet.
Derulo, who at 21 is two years younger than Bingle, has called her “hot” in an interview.
The couple first got together when he toured Australia in November.
They were snapped cuddling at a hotel pool in Brisbane just a few days after meeting.
Bingle is meant to be returning to Australia in the next few days.