The former September issue cover star held up the Matthew Williamson show on Sunday by a whole 30 minutes because she was having car troubles.
A source reveals:
"Sienna and Matthew are so close that he refused to start the show until she had arrived and, since her taxi was late, she held the show up by half an hour. Normally people understand that things run late in LFW but fashion royalty Anna Wintour was sitting front row and you do not keep her waiting. She was about to leave when Sienna literally came sprinting in."
Maybe if Sienna was talking to God, Anna would be more understanding.
[Image via Lia Toby/Daniel Deme/WENN.]