Don't worry, guys, it wasn't HER wedding but a friend's. Sharapova was tweeting and Facebooking from her friend's wedding all night, which while not great etiquette, was excellent entertainment for tennis fans.
She posted the above photo to her Facebook page with the caption
Send me an invitation to a wedding and I will show up with bells and whistles! Just kidding, only borrowing this incredible head piece
I have no idea if she was being sarcastic when she called this silver hat thing 'incredible' or not (you never know with these fashion types!).
Can't deny that this was one fancy looking wedding though!