The 43-year-old "Iron Man 3" star is planning to tie the knot with producer Brad Falchuk and has even enlisted the services of a wedding planner, reported Femalefirst.
"Gwyneth and Brad are talking seriously about marriage and are in the process of picking a day at the end of autumn and they want something low key, most likely in the desert where they often go for weekend breaks," a source said.
The actress' divorce from Coldplay frontman Chris Martin - the father of her children Apple, 12, and 10-year-old Moses, was finalized earlier this month.
"She's also very keen to try for a baby with Brad. She's always talked about having a third child in her forties, even when she was with Chris, but the thought of doing this with Brad feels right. But first things first - a wedding," the source added.