But the headline-grabbing event may have been just a dress rehearsal.
The bride-to-be arrived at the bash wearing a floor-length maroon gown with a thigh-high slit and one-shoulder silhouette, while other famous guests, like Karlie Kloss, sparkled in head-to-toe sequins.
On the third finger of her left hand she sported a giant sapphire that looked like it had come from an upmarket Christmas cracker.
Paltrow, 45, and Falchuk, 47, announced their engagement in January.More news: VAR chaos strikes again as Bundesliga referee hands Mainz 'half-time' penalty
And stars this evening, on a holiday, Paltrow and Felczaka gathered enough: Jennifer aniston, demi Moore, Kate Hudson, Liv Tyler, Julia Roberts, Reese Witherspoon, Cameron Diaz... the List the list is still long.
One person who was notably absent from the festivities was Chris Martin - ex-husband to Gwyneth and co-parent to their two children - Apple and Moses - but given the nature of the event, it makes sense.
"Not only because I believe I have found the man I was meant to be with, but because I have accepted the soul-stretching, pattern-breaking opportunities that (terrifyingly) are made possible by intimacy".
She however did not address speculation that it was in fact a secret wedding. "There will never be adequate words to express our gratitude".