See who attended Gwyneth Paltrow's star-studded engagement party

<p>Love was in the air on Saturday (Apr. 14)! Gwyneth Paltrow's closest industry pals dusted off their glitziest outfits and descended on the Los Angeles Theatre to celebrate the actress and producer Brad Falchuk's undying love for each other.</p> <p>The fiesta was more star-studded than some red carpets! Big names like Jennifer Aniston, Kate Hudson and Cameron Diaz all made gorgeous appearances – both with and without their own significant others. A source close to the soon-to-be newlyweds told <a href="http://people.com/movies/gwyneth-paltrow-engagement-party-intimate-special/"><strong><em>People</em></strong></a> that “it was an old-school and very glamorous Hollywood event... even with all the celebs, it wasn’t a stuffy party. Instead, lots of candles and fragrant flowers created a romantic atmosphere. It felt intimate and very special. You could tell that all guests very much love the couple."</p> <p>The black-tie event, which some are speculating was a rehearsal dinner or even a secret wedding, comes on the heels of her bachelorette getaway in Mexico, where Gwyn and her BFFs sipped champagne and sunned themselves on the white sands of Cabo.</p> <p><strong>Click through to see all the best photos from her engagement party...</strong></p> <p>Photos: &copy; Backgrid</p>
<p>The woman of the hour! Gwyneth showed off her bachelorette weekend tan, courtesy of Mexico, in an ethereal maroon ruffled gown. Showing just the right amount of skin, the star let her natural beauty shine while celebrating a new chapter in her life.</p> <p>Photo: &copy; Backgrid</p>
<p>And the man of the hour arrived shortly after! Looking dapper as ever in a white tuxedo, Brad Falchuk made his way into the party.</p> <p>Photo: &copy; Splash News</p>
<p>Mom was in the house... carrying a bridal garment bag! Gwyneth's mother Blythe Danner was happy as a clam leaving the big party, but the bag in question has left many questioning if this engagement fete was <em>actually</em> a secret wedding.</p> <p>Photo: &copy; Backgrid</p>
<p>A newly single Jennifer Aniston was the picture of elegance in a stunning black gown for her pal's party. The <em>Friends</em> alum recently split from Justin Theroux, to whom she was married for nearly three years.</p> <p>Photo: &copy; Backgrid</p>
<p>Cameron Diaz brought along hubby Benji Madden for the engagement party, days after joining BFF Gwyn in Mexico for a sunny bachelorette party. The <em>Charlie's Angels</em> star looked red hot in this glittery number!</p> <p>Photo: &copy; Backgrid</p>
<p>Kate Hudson brought some colour to the party in a stunning yellow gown, walking hand-in-hand with her boyfriend Danny Fujikawa. The actress is expecting her third child and her first with Danny – and <a href="https://www.facebook.com/HELLOCanadaMagazine/videos/10160524759095227/"><strong>the gender reveal</strong></a> was totally adorable!</p> <p>Photo: &copy; Backgrid</p>
<p>Julia Roberts was also there with her husband Daniel Moder clad in a black sequinned jumpsuit.</p> <p>Photo: &copy; Splash News</p>
<p><em>Big Little Lies</em> star Reese Witherspoon showed off her megawatt smile while arriving at the party! The mother of three, who's currently filming the TV show's second season, dazzled in a black mini dress and matching pumps.</p> <p>Photo: &copy; Backgrid</p>
<p>Demi Moore arrived at Gwyneth's lavish event looking gothic chic.</p> <p>Photo: &copy; Splash News</p>
<p>Even Steven Spielberg was on hand to celebrate with his gorgeous wife, Kate Capshaw, and both looked to be having a blast!</p> <p>Photo: &copy; Splash News</p>
<p>Comedian Chelsea Handler made her way into the festivities looked sophisticated and elegant in an all-black ensemble.</p> <p>Photo: &copy; Backgrid</p>
<p>Rob Lowe and his wife Sheryl Berkoff were all smiles while leaving Gwyneth's engagement party. The darling duo looked chic as ever in matching black outfits.</p> <p>Photo: &copy; Backgrid</p>
<p>Liv Tyler was positively glowing alongside her handsome husband David Gardner. The 40-year-old actress and Gwyneth are long-time friends, so it's no surprise Liv was there to help celebrate her engagement.</p> <p>Photo: &copy; Backgrid</p>
<p>Karlie Kloss showed off her golden figure in this dazzling one shoulder number while leaving Gwyneth's party with writer Derek Blasberg.</p> <p>Photo: &copy; Backgrid</p>
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