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According to sources, Timberlake ended his relationship with Jessica Biel earlier this month because he had developed feelings for his Friends With Benefits co-star.
Kunis broke up with actor Macaulay Culkin in January and is allegedly waiting before she starts a romance with Timberlake.
An insider told Now: "She doesn't want to be seen as a home wrecker. She's into monogamy so she ended it with Macaulay because she was attracted to Justin.
"But she doesn't want to be another one of his conquests, so she's asked for space. Justin agrees they should wait a while out of respect for Jessica."
Biel is said to be "devastated" about the break-up, which came shortly after she threw a surprise 30th birthday party for the singer and actor in January.
Watch the trailer for Friends With Benefits below:
