The Hollywood couple celebrated their engagement with an A-list party thrown by Falchuk's TV producing partner Ryan Murphy in Los Angeles over the weekend, which Page Six previously reported may have been a "secret" wedding ceremony.
The event was billed as "party on the occasion of engagement", however, Western journalists believe that it was a wedding, and Gwyneth arrived at the celebration in a dress of Burgundy, to confuse the press.
"Thank you #ryanmurphy for the most incredible evening to celebrate our (love)", she writes on Instagram alongside a picture from the party.
"She continued, "@giambattistavalliparis I will never get over my gorgeous dress.
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Having eloped with Chris, Gwyneth says she is treating this wedding as her first and is pulling out all the traditional stops. @georgieeisdell thank you. @hairbylorenzomartin thank you.
Paltrow's ex, Coldplay star Chris Martin, was absent from the event. Paltrow and Falchuk met when the actress guest-starred on Glee in 2010 and the pair have been dating since 2014, after her split. We feel like the luckiest people on the planet because we have you in our lives.
This follows a "hen party" - which is a bachelorette bash - with her friends in Mexico where they got spa treatments last week at the Costa Palmas Four Seasons.