Stars in attendance included Cameron Diaz, who planned Paltrow's bachelorette party, and other Hollywood A-listers, Reese Witherspoon, Kate Hudson, Jennifer Aniston, Julia Roberts, Liv Tyler and Demi Moore.
Following a quick getaway to Cabo San Lucas, Mexico for a couple of days with her girlfriends, Gwyneth Paltrow was back to celebrating her engagement to fiancé, Brad Falchuk, on Saturday evening with a black-tie party.
Gwyneth Paltrow arrives to her rumoured wedding to Brad Falchuk at The Los Angeles Theater on the weekend.
Model Karlie Kross was there along with Gwyneth's mother Blythe Danner who carried a dress bag from Monique Lhuillier, known for her brides' outfits.
Paltrow's rep did not immediately return a request for comment.
Falchuck and Murphy together created hit TV shows Glee and American Horror Story, while Oscar victor Paltrow has made her name in recent years appearing the Marvel Cinematic Universe.
Photographers outside the venue - whose marquee featured two signs which read "GP Loves BF" and "BF Loves GP" - saw both Paltrow and Falchuk entering separately, with the 45-year-old actress wearing a maroon gown and 47-year-old Falchuk in a white dinner jacket.
Gwyn and Chris famously eloped when they married in 2003, so the actress says she is treating this wedding as though it's her first. "They send me pictures of dresses - they're as excited about it as I am", she added.