Jennifer Aniston, Steven Spielberg and Julia Roberts join 400 guests at 'secret wedding' but her ex Chris Martin is nowhere to be seen

Gwyneth, 45, and Brad, 47, (centre) sent Hollywood into a frenzy on Saturday night, as they threw a huge star-studded 'engagement' party for up to 400 people, which some believe was their 'secret wedding'. Just days after her bachelorette party in Mexico, the couple hired out the historic Los Angeles Theater for a fancy black tie bash, attended by A-listers including (from left) Kate Hudson, Cameron Diaz with husband Benji Madden, Jennifer Aniston and Reese Witherson. Gwyneth's famous mother Blythe Danner also appeared to give the game away when she carried a dress bag from bridal designer Monique Lhuillier out of the venue later that night, while some of the guests wore bridal-style corsages.