Paris Jackson, 16, and her boyfriend, who still hasn't been named, are reportedly expecting a child together.
A US source was quoted by the Daily Star newspaper as saying: "I saw her at dinner and she twice made a toast drinking water instead of wine."
They added: "That and the prominent stomach bulge got people talking."
News that the late Michael Jackson's daughter may be expecting her first child comes just days after she was reportedly spotted looking at engagement rings with her beau.
The newspaper also added that people who claim to be close to the couple are “convinced” an engagement is inevitable.
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A source said: “She's madly in love with him.”
Her spokesman has, as of yet, refused to deny the rumours surrounding the teenager.
They simply said: “I do not comment on her personal life.”
Paris has stayed away from the spotlight for the past year following her attempted suicide last June.
She has since been given the all-clear from doctors after spending some time at a therapeutic boarding school.