Ashlee Simpson) at the wedding of her close friend and former assistant Lauren Zelman - who was tying the knot with Reaper actor Bret Harrison.
It's a very brave bride that includes very famous celebrities in their wedding party. Not that we're suggesting that she was at all upstaged in any way...
Check out Jessica doing a 'Demi Moore' and baring all (plus bump) for the cover of Elle.
See our pick of Jessica's top ten style moments here: