Gwyneth Paltrow and fiancé, Brad Falchuk, had a star-studded engagement party on Saturday held at the Los Angeles Theater, which many speculated was actually the wedding ceremony.

A-List Guests

A few months after announcing their engagement in January, the couple gathered some of the Hollywood A-list celebrities for a black-tie party extravaganza held in downtown Los Angeles. According to reports, there were 400 guests at the engagement party, which series creator and Falchuk's business partner Ryan Murphy (Glee, American Horror Story) organized for the couple.

The signage outside the Los Angeles Theater boasted sweet messages for everyone to see, including "BF Loves GP" and "GP Loves BF." Of course, the initials stand for the couple's names, Gwyneth Paltrow and Brad Falchuk.

Paltrow arrived at the event wearing a floor-length one-shoulder maroon dress and her fiancé opted for white tuxedo. Other celebrities donned on their best smile and wardrobe for the memorable gathering.

Among the stars in attendance at the engagement party were Reese Witherspoon, who paired her black dress with chandelier earrings, Jennifer Aniston who wore a black choker necklace and strapless dress. She also sported a wrist brace.

Demi Moore looked young beyond her years in a daring outfit that revealed her toned stomach. Julia Roberts was also at the party in a flowing dress and a pair of spectacles. She paired her outfit with a shiny red purse.

Meanwhile, pregnant Kate Hudson wore a yellow ruffled dress and Cameron Diaz wore a red dress. Her husband musician Benji Madden was also at the party.

Other celebrities invited to the star-studded event took to their respective social media pages to share the moment with the followers. Comedian Chelsea Handler shared a Boomerang clip of her outfit on Instagram.

 Headed to celebrate my friend’s engagement. A post shared by  Chelsea Handler (@chelseahandler) on Apr 14, 2018 at 5:55pm PDT

Jen Meyer shared a selfie with Sara Foster and Jerry Seinfeld's wife, Jessica, showcased the purple sequined dress she wore to the party on her Instagram. Meanwhile, Giancarlo Giammetti of Valentino posted his best wishes to the engaged couple alongside their photo.

Steven Spielberg, Liv Tyler, and Dave Gardner were also at the event. Coldplay frontman Chris Martin and Paltrow's ex-husband was not at the party.

Wedding Rehearsal

Paltrow's mother, Blythe Danner, was at the event too and she even raised speculations that the party was the actual wedding or the wedding rehearsal. She was photographed leaving the theater carrying a dress bag with the name Monique Lhuillier printed on the front. The designer is a favorite among celebrities when it comes to her bridal gowns.

However, the guests did not give anything away when asked for details after the engagement party. Paltrow’s rep also did not reply to request for comments.

Tags: Gwyneth Paltrow Brad Falchuk ryan murphy Blythe Danner Monique Lhuillier