Gwyneth Paltrow celebrated her 42nd birthday with her children and her soon-to-be ex-husband Chris Martin at a small garden party at her Brentwood, California, home on Saturday afternoon.
"Gwyneth had a casual celebration during the day that Chris was a part of," a source tells PEOPLE.
"Many gifts arrived at the house, including flowers and art work."
The festivities continued into the evening as a parade of celebs including Kate Hudson and fiancé Matt Bellamy, Tobey Maguire and wife Jennifer Meyer Maguire, Nicole
Chris Martin is now dating Jennifer Lawrence, but she did not attend Gwyneth's birthday celebration.
"It seems they are definitely getting more serious," says a source of the new couple. "Whenever Chris is not spending time with Apple and Moses at his Malibu, [California], house, Jen is there.”
"Chris and Jen always time it so that after Gwyneth picks up the kids (Apple 10, and Moses, 8), Jen will arrive in Malibu minutes after," adds the source.