If you're a celebrity attendee invited to the Royal Wedding, chances are you won't be able to post on social media at all during the ceremony.
However, some of the famous attendees are beginning to spam their social media accounts with info about the day; and we'll be rounding it up here as the evening goes on.
Serena will be attending the wedding with her husband, Reddit founder Alexis Ohanian, and has already shared some adorable getting-ready snaps to her Instagram and Instagram story.
As one of the wedding's most anticipated guests, Quantico star Priyanka has already shared pictures to her Instagram getting ready for the day.
She also shared pictures from hatmaker Philip Treacy's studio in London, and a snap alluding to some last-minute outfit drama.
Meghan's ex-Suits co-star appears to be getting ready for the occasion in a stunning gown by Lanvin.
Emma Bunton (Baby Spice)
Baby Spice was one of the three Spice Girl members invited, and shared a photo of herself and her adorable pink fascinator (we'd expect nothing less).
Meghan's on-screen love interest from Suits confirmed he's in London — in a ridiculously adorable way.